diff --git a/applications/utilities/parallelProcessing/decomposePar/decomposePar.C b/applications/utilities/parallelProcessing/decomposePar/decomposePar.C
index d011fe4a4b..5edafcf561 100644
--- a/applications/utilities/parallelProcessing/decomposePar/decomposePar.C
+++ b/applications/utilities/parallelProcessing/decomposePar/decomposePar.C
@@ -312,7 +312,7 @@ int main(int argc, char *argv[])
 
     fileNameList cloudDirs
     (
-        readDir(runTime.timePath()/cloud::subInstance, fileName::DIRECTORY)
+        readDir(runTime.timePath()/cloud::prefix, fileName::DIRECTORY)
     );
 
     // Particles
@@ -344,7 +344,7 @@ int main(int argc, char *argv[])
         (
             mesh,
             runTime.timeName(),
-            cloud::subInstance/cloudDirs[i]
+            cloud::prefix/cloudDirs[i]
         );
 
         IOobject* positionsPtr = sprayObjs.lookup("positions");
@@ -418,7 +418,7 @@ int main(int argc, char *argv[])
             (
                 mesh,
                 runTime.timeName(),
-                cloud::subInstance/cloudDirs[cloudI]
+                cloud::prefix/cloudDirs[cloudI]
             );
 
             lagrangianFieldDecomposer::readFields
diff --git a/applications/utilities/parallelProcessing/decomposePar/lagrangianFieldDecomposerDecomposeFields.C b/applications/utilities/parallelProcessing/decomposePar/lagrangianFieldDecomposerDecomposeFields.C
index 0ed0071aae..ae85229808 100644
--- a/applications/utilities/parallelProcessing/decomposePar/lagrangianFieldDecomposerDecomposeFields.C
+++ b/applications/utilities/parallelProcessing/decomposePar/lagrangianFieldDecomposerDecomposeFields.C
@@ -88,7 +88,7 @@ tmp<IOField<Type> > lagrangianFieldDecomposer::decomposeField
             (
                 field.name(),
                 procMesh_.time().timeName(),
-                cloud::subInstance/cloudName,
+                cloud::prefix/cloudName,
                 procMesh_,
                 IOobject::NO_READ,
                 IOobject::NO_WRITE
diff --git a/applications/utilities/parallelProcessing/reconstructPar/reconstructLagrangianFields.C b/applications/utilities/parallelProcessing/reconstructPar/reconstructLagrangianFields.C
index 705881be10..a6fc1a49a8 100644
--- a/applications/utilities/parallelProcessing/reconstructPar/reconstructLagrangianFields.C
+++ b/applications/utilities/parallelProcessing/reconstructPar/reconstructLagrangianFields.C
@@ -47,7 +47,7 @@ Foam::tmp<Foam::IOField<Type> > Foam::reconstructLagrangianField
             (
                 fieldName,
                 mesh.time().timeName(),
-                cloud::subInstance/cloudName,
+                cloud::prefix/cloudName,
                 mesh,
                 IOobject::NO_READ,
                 IOobject::NO_WRITE
@@ -64,7 +64,7 @@ Foam::tmp<Foam::IOField<Type> > Foam::reconstructLagrangianField
         (
             fieldName,
             meshes[i].time().timeName(),
-            cloud::subInstance/cloudName,
+            cloud::prefix/cloudName,
             meshes[i],
             IOobject::MUST_READ,
             IOobject::NO_WRITE
diff --git a/applications/utilities/parallelProcessing/reconstructPar/reconstructPar.C b/applications/utilities/parallelProcessing/reconstructPar/reconstructPar.C
index fe43c44251..8458e7f570 100644
--- a/applications/utilities/parallelProcessing/reconstructPar/reconstructPar.C
+++ b/applications/utilities/parallelProcessing/reconstructPar/reconstructPar.C
@@ -277,7 +277,7 @@ int main(int argc, char *argv[])
             (
                 readDir
                 (
-                    databases[procI].timePath()/regionPrefix/cloud::subInstance,
+                    databases[procI].timePath()/regionPrefix/cloud::prefix,
                     fileName::DIRECTORY
                 )
             );
@@ -295,7 +295,7 @@ int main(int argc, char *argv[])
                     (
                         procMeshes.meshes()[procI],
                         databases[procI].timeName(),
-                        cloud::subInstance/cloudDirs[i]
+                        cloud::prefix/cloudDirs[i]
                     );
 
                     IOobject* positionsPtr = sprayObjs.lookup("positions");
diff --git a/applications/utilities/postProcessing/dataConversion/foamToEnsight/foamToEnsight.C b/applications/utilities/postProcessing/dataConversion/foamToEnsight/foamToEnsight.C
index 06dd108985..10d261bca5 100644
--- a/applications/utilities/postProcessing/dataConversion/foamToEnsight/foamToEnsight.C
+++ b/applications/utilities/postProcessing/dataConversion/foamToEnsight/foamToEnsight.C
@@ -211,7 +211,7 @@ int main(int argc, char *argv[])
 
         fileNameList cloudDirs = readDir
         (
-            runTime.timePath()/regionPrefix/cloud::subInstance,
+            runTime.timePath()/regionPrefix/cloud::prefix,
             fileName::DIRECTORY
         );
 
@@ -221,7 +221,7 @@ int main(int argc, char *argv[])
             (
                 mesh,
                 runTime.timeName(),
-                cloud::subInstance/cloudDirs[cloudI]
+                cloud::prefix/cloudDirs[cloudI]
             );
 
             IOobject* positionsPtr = cloudObjs.lookup("positions");
@@ -266,7 +266,7 @@ int main(int argc, char *argv[])
             (
                 mesh,
                 runTime.timeName(),
-                cloud::subInstance/cloudIter.key()
+                cloud::prefix/cloudIter.key()
             );
 
             forAllConstIter(IOobjectList, cloudObjs, fieldIter)
@@ -426,7 +426,7 @@ int main(int argc, char *argv[])
 
             fileNameList currentCloudDirs = readDir
             (
-                runTime.timePath()/regionPrefix/cloud::subInstance,
+                runTime.timePath()/regionPrefix/cloud::prefix,
                 fileName::DIRECTORY
             );
 
@@ -449,7 +449,7 @@ int main(int argc, char *argv[])
                 (
                     fieldName,
                     mesh.time().timeName(),
-                    cloud::subInstance/cloudName,
+                    cloud::prefix/cloudName,
                     mesh,
                     IOobject::MUST_READ
                 );
diff --git a/applications/utilities/postProcessing/dataConversion/foamToEnsightParts/ensightOutputCase.H b/applications/utilities/postProcessing/dataConversion/foamToEnsightParts/ensightOutputCase.H
index 1ef4c55032..0e3530b9c0 100644
--- a/applications/utilities/postProcessing/dataConversion/foamToEnsightParts/ensightOutputCase.H
+++ b/applications/utilities/postProcessing/dataConversion/foamToEnsightParts/ensightOutputCase.H
@@ -42,7 +42,7 @@ forAllConstIter(HashTable<HashTable<word> >, cloudFields, cloudIter)
 
     caseFile
         << setw(16) << "measured: 2"
-        << fileName(dataMask/cloud::subInstance/cloudName/"positions").c_str()
+        << fileName(dataMask/cloud::prefix/cloudName/"positions").c_str()
             << nl;
 }
 caseFile
@@ -122,7 +122,7 @@ forAllConstIter(HashTable<HashTable<word> >, cloudFields, cloudIter)
                 ensightType,
                 fieldName,
                 dataMask,
-                cloud::subInstance/cloudName,
+                cloud::prefix/cloudName,
                 cloudNo,
                 2
             );
diff --git a/applications/utilities/postProcessing/dataConversion/foamToEnsightParts/ensightOutputFunctions.C b/applications/utilities/postProcessing/dataConversion/foamToEnsightParts/ensightOutputFunctions.C
index 7e1a992f88..e62b10064c 100644
--- a/applications/utilities/postProcessing/dataConversion/foamToEnsightParts/ensightOutputFunctions.C
+++ b/applications/utilities/postProcessing/dataConversion/foamToEnsightParts/ensightOutputFunctions.C
@@ -100,7 +100,7 @@ void ensightParticlePositions
 {
     Cloud<passiveParticle> parcels(mesh, cloudName, false);
 
-    fileName cloudDir = subDir/cloud::subInstance/cloudName;
+    fileName cloudDir = subDir/cloud::prefix/cloudName;
     fileName postFileName = cloudDir/"positions";
 
     // the ITER/lagrangian subdirectory must exist
@@ -164,7 +164,7 @@ void ensightLagrangianField
 {
     Info<< " " << fieldObject.name() << flush;
 
-    fileName cloudDir = subDir/cloud::subInstance/cloudName;
+    fileName cloudDir = subDir/cloud::prefix/cloudName;
     fileName postFileName = cloudDir/fieldObject.name();
 
     string title =
diff --git a/applications/utilities/postProcessing/dataConversion/foamToEnsightParts/findFields.H b/applications/utilities/postProcessing/dataConversion/foamToEnsightParts/findFields.H
index 7170059b08..edfbb5ae7d 100644
--- a/applications/utilities/postProcessing/dataConversion/foamToEnsightParts/findFields.H
+++ b/applications/utilities/postProcessing/dataConversion/foamToEnsightParts/findFields.H
@@ -36,7 +36,7 @@ if (timeDirs.size() > 1)
         runTime.path()
       / timeDirs[timeDirs.size() - 1].name()
       / regionPrefix
-      / cloud::subInstance,
+      / cloud::prefix,
         fileName::DIRECTORY
     );
 
@@ -55,7 +55,7 @@ if (timeDirs.size() > 1)
         (
             mesh,
             timeDirs[timeDirs.size() - 1].name(),
-            cloud::subInstance/cloudName
+            cloud::prefix/cloudName
         );
 
         bool hasPositions = false;
diff --git a/applications/utilities/postProcessing/dataConversion/foamToEnsightParts/foamToEnsightParts.C b/applications/utilities/postProcessing/dataConversion/foamToEnsightParts/foamToEnsightParts.C
index 1665550632..af2dee175a 100644
--- a/applications/utilities/postProcessing/dataConversion/foamToEnsightParts/foamToEnsightParts.C
+++ b/applications/utilities/postProcessing/dataConversion/foamToEnsightParts/foamToEnsightParts.C
@@ -329,7 +329,7 @@ int main(int argc, char *argv[])
                 !isDir
                 (
                     runTime.timePath()/regionPrefix/
-                    cloud::subInstance/cloudName
+                    cloud::prefix/cloudName
                 )
             )
             {
@@ -340,7 +340,7 @@ int main(int argc, char *argv[])
             (
                 mesh,
                 runTime.timeName(),
-                cloud::subInstance/cloudName
+                cloud::prefix/cloudName
             );
 
             // check that the positions field is present for this time
@@ -372,7 +372,7 @@ int main(int argc, char *argv[])
                 if (!fieldObject)
                 {
                     Info<< "missing "
-                        << runTime.timeName()/cloud::subInstance/cloudName
+                        << runTime.timeName()/cloud::prefix/cloudName
                         / fieldName
                         << endl;
                     continue;
diff --git a/applications/utilities/postProcessing/dataConversion/foamToFieldview9/createSprayFields.H b/applications/utilities/postProcessing/dataConversion/foamToFieldview9/createSprayFields.H
index f6ee45f1bb..a5a218de80 100644
--- a/applications/utilities/postProcessing/dataConversion/foamToFieldview9/createSprayFields.H
+++ b/applications/utilities/postProcessing/dataConversion/foamToFieldview9/createSprayFields.H
@@ -21,7 +21,7 @@ List<IOField<vector>* > sprayVectorFieldPtrs
         (
             sprayScalarNames[fieldI],
             runTime.timeName(),
-            cloud::subInstance,
+            cloud::prefix,
             mesh,
             IOobject::MUST_READ,
             IOobject::NO_WRITE
@@ -53,7 +53,7 @@ List<IOField<vector>* > sprayVectorFieldPtrs
         (
             sprayVectorNames[fieldI],
             runTime.timeName(),
-            cloud::subInstance,
+            cloud::prefix,
             mesh,
             IOobject::MUST_READ,
             IOobject::NO_WRITE
diff --git a/applications/utilities/postProcessing/dataConversion/foamToFieldview9/getFieldNames.H b/applications/utilities/postProcessing/dataConversion/foamToFieldview9/getFieldNames.H
index 4b39cf68bb..129d788738 100644
--- a/applications/utilities/postProcessing/dataConversion/foamToFieldview9/getFieldNames.H
+++ b/applications/utilities/postProcessing/dataConversion/foamToFieldview9/getFieldNames.H
@@ -42,7 +42,7 @@ forAll(Times, timeI)
 
 
     // Same for spray
-    IOobjectList sprayObjects(mesh, runTime.timeName(), cloud::subInstance);
+    IOobjectList sprayObjects(mesh, runTime.timeName(), cloud::prefix);
     {
         wordList fieldNames(sprayObjects.names(scalarIOField::typeName));
         forAll(fieldNames, fieldI)
diff --git a/applications/utilities/postProcessing/dataConversion/foamToGMV/foamToGMV.C b/applications/utilities/postProcessing/dataConversion/foamToGMV/foamToGMV.C
index de0776df6c..6c7e23ebae 100644
--- a/applications/utilities/postProcessing/dataConversion/foamToGMV/foamToGMV.C
+++ b/applications/utilities/postProcessing/dataConversion/foamToGMV/foamToGMV.C
@@ -49,7 +49,7 @@ int main(int argc, char *argv[])
         "volScalarField",
         "volVectorField",
         "surfaceScalarField",
-        cloud::subInstance
+        cloud::prefix
     };
 
 #   include "setRootCase.H"
diff --git a/applications/utilities/postProcessing/dataConversion/foamToGMV/gmvOutput.H b/applications/utilities/postProcessing/dataConversion/foamToGMV/gmvOutput.H
index 237c8765b8..03523ed2de 100644
--- a/applications/utilities/postProcessing/dataConversion/foamToGMV/gmvOutput.H
+++ b/applications/utilities/postProcessing/dataConversion/foamToGMV/gmvOutput.H
@@ -1,12 +1,12 @@
-for(label i=0; i < nTypes; i++)
+for (label i=0; i < nTypes; i++)
 {
     wordList fieldNames = objects.names(fieldTypes[i]);
 
-    if ( fieldTypes[i] == "volScalarField" )
+    if (fieldTypes[i] == "volScalarField")
     {
         gmvFile << "variable" << nl;
     }
-    for(label j=0; j < fieldNames.size(); j++)
+    for (label j=0; j < fieldNames.size(); j++)
     {
 
         word fieldName = fieldNames[j];
@@ -20,7 +20,7 @@ for(label i=0; i < nTypes; i++)
             IOobject::NO_WRITE
         );
 
-        if ( fieldTypes[i] == "volScalarField" )
+        if (fieldTypes[i] == "volScalarField")
         {
             volScalarField gmvScalarField(fieldObject, mesh);
             gmvFile << fieldName << " 0" << nl;
@@ -31,21 +31,21 @@ for(label i=0; i < nTypes; i++)
             gmvFile << nl;
         }
 
-        if ( fieldTypes[i] == "volVectorField" )
+        if (fieldTypes[i] == "volVectorField")
         {
             if (fieldName == vComp)
             {
                 volVectorField gmvVectorField(fieldObject, mesh);
                 gmvFile << "velocity 0" << nl;
-                for(label indx=0;indx<mesh.nCells();indx++)
+                for (label indx=0;indx<mesh.nCells();indx++)
                 {
                     gmvFile << gmvVectorField[indx].x() << " ";
                 }
-                for(label indx=0;indx<mesh.nCells();indx++)
+                for (label indx=0;indx<mesh.nCells();indx++)
                 {
                     gmvFile << gmvVectorField[indx].y() << " ";
                 }
-                for(label indx=0;indx<mesh.nCells();indx++)
+                for (label indx=0;indx<mesh.nCells();indx++)
                 {
                     gmvFile << gmvVectorField[indx].z() << " ";
                 }
@@ -53,20 +53,20 @@ for(label i=0; i < nTypes; i++)
             }
         }
 
-        if ( fieldTypes[i] == "surfaceScalarField" )
+        if (fieldTypes[i] == "surfaceScalarField")
         {
             // ...
         }
 
     }
 
-    if ( fieldTypes[i] == cloud::subInstance )
+    if (fieldTypes[i] == cloud::prefix)
     {
         IOobject lagrangianHeader
         (
             "positions",
             runTime.timeName(),
-            cloud::subInstance,
+            cloud::prefix,
             mesh,
             IOobject::NO_READ
         );
@@ -75,7 +75,7 @@ for(label i=0; i < nTypes; i++)
         {
             Cloud<passiveParticle> particles(mesh);
 
-            IOobjectList objects(mesh, runTime.timeName(), cloud::subInstance);
+            IOobjectList objects(mesh, runTime.timeName(), cloud::prefix);
 
             wordList lagrangianScalarNames = objects.names("scalarField");
             wordList lagrangianVectorNames = objects.names("vectorField");
@@ -87,7 +87,7 @@ for(label i=0; i < nTypes; i++)
         }
     }
 
-    if ( fieldTypes[i] == "volScalarField" )
+    if (fieldTypes[i] == "volScalarField")
     {
         gmvFile << "endvars" << nl;
     }
diff --git a/applications/utilities/postProcessing/dataConversion/foamToGMV/gmvOutputLagrangian.H b/applications/utilities/postProcessing/dataConversion/foamToGMV/gmvOutputLagrangian.H
index 28104661de..a99b94133e 100644
--- a/applications/utilities/postProcessing/dataConversion/foamToGMV/gmvOutputLagrangian.H
+++ b/applications/utilities/postProcessing/dataConversion/foamToGMV/gmvOutputLagrangian.H
@@ -42,7 +42,7 @@ forAll(lagrangianScalarNames, i)
         (
             name,
             runTime.timeName(),
-            cloud::subInstance,
+            cloud::prefix,
             mesh,
             IOobject::MUST_READ,
             IOobject::NO_WRITE
@@ -73,7 +73,7 @@ forAll(lagrangianVectorNames, i)
         (
             name,
             runTime.timeName(),
-            cloud::subInstance,
+            cloud::prefix,
             mesh,
             IOobject::MUST_READ,
             IOobject::NO_WRITE
diff --git a/applications/utilities/postProcessing/dataConversion/foamToGMV/gmvOutputSpray.H b/applications/utilities/postProcessing/dataConversion/foamToGMV/gmvOutputSpray.H
index b0beea2274..3c4f629235 100644
--- a/applications/utilities/postProcessing/dataConversion/foamToGMV/gmvOutputSpray.H
+++ b/applications/utilities/postProcessing/dataConversion/foamToGMV/gmvOutputSpray.H
@@ -40,7 +40,7 @@ forAll(lagrangianScalarNames, i)
         (
             name,
             runTime.timeName(),
-            cloud::subInstance,
+            cloud::prefix,
             mesh,
             IOobject::MUST_READ,
             IOobject::NO_WRITE
diff --git a/applications/utilities/postProcessing/dataConversion/foamToVTK/foamToVTK.C b/applications/utilities/postProcessing/dataConversion/foamToVTK/foamToVTK.C
index c98088ff46..793e18c05b 100644
--- a/applications/utilities/postProcessing/dataConversion/foamToVTK/foamToVTK.C
+++ b/applications/utilities/postProcessing/dataConversion/foamToVTK/foamToVTK.C
@@ -914,7 +914,7 @@ int main(int argc, char *argv[])
         (
             readDir
             (
-                runTime.timePath()/regionPrefix/cloud::subInstance,
+                runTime.timePath()/regionPrefix/cloud::prefix,
                 fileName::DIRECTORY
             )
         );
@@ -925,18 +925,18 @@ int main(int argc, char *argv[])
             (
                 mesh,
                 runTime.timeName(),
-                cloud::subInstance/cloudDirs[i]
+                cloud::prefix/cloudDirs[i]
             );
 
             IOobject* positionsPtr = sprayObjs.lookup("positions");
 
             if (positionsPtr)
             {
-                mkDir(fvPath/cloud::subInstance/cloudDirs[i]);
+                mkDir(fvPath/cloud::prefix/cloudDirs[i]);
 
                 fileName lagrFileName
                 (
-                    fvPath/cloud::subInstance/cloudDirs[i]/cloudDirs[i]
+                    fvPath/cloud::prefix/cloudDirs[i]/cloudDirs[i]
                   + "_" + name(timeI) + ".vtk"
                 );
 
diff --git a/applications/utilities/postProcessing/dataConversion/foamToVTK/lagrangianWriterTemplates.C b/applications/utilities/postProcessing/dataConversion/foamToVTK/lagrangianWriterTemplates.C
index e558186e39..0407a58841 100644
--- a/applications/utilities/postProcessing/dataConversion/foamToVTK/lagrangianWriterTemplates.C
+++ b/applications/utilities/postProcessing/dataConversion/foamToVTK/lagrangianWriterTemplates.C
@@ -41,7 +41,7 @@ void Foam::lagrangianWriter::writeIOField(const wordList& objects)
         (
             object,
             vMesh_.mesh().time().timeName(),
-            cloud::subInstance/cloudName_,
+            cloud::prefix/cloudName_,
             vMesh_.mesh(),
             IOobject::MUST_READ,
             IOobject::NO_WRITE,
diff --git a/applications/utilities/postProcessing/graphics/PV3FoamReader/vtkPV3Foam/vtkPV3FoamFields.C b/applications/utilities/postProcessing/graphics/PV3FoamReader/vtkPV3Foam/vtkPV3FoamFields.C
index c6d96a37ef..38cc52f680 100644
--- a/applications/utilities/postProcessing/graphics/PV3FoamReader/vtkPV3Foam/vtkPV3FoamFields.C
+++ b/applications/utilities/postProcessing/graphics/PV3FoamReader/vtkPV3Foam/vtkPV3FoamFields.C
@@ -266,7 +266,7 @@ void Foam::vtkPV3Foam::convertLagrangianFields
         (
             mesh,
             dbPtr_().timeName(),
-            cloud::subInstance/cloudName
+            cloud::prefix/cloudName
         );
         pruneObjectList(objects, selectedFields);
 
diff --git a/applications/utilities/postProcessing/graphics/PV3FoamReader/vtkPV3Foam/vtkPV3FoamMeshLagrangian.C b/applications/utilities/postProcessing/graphics/PV3FoamReader/vtkPV3Foam/vtkPV3FoamMeshLagrangian.C
index b84194cd7b..07d322d542 100644
--- a/applications/utilities/postProcessing/graphics/PV3FoamReader/vtkPV3Foam/vtkPV3FoamMeshLagrangian.C
+++ b/applications/utilities/postProcessing/graphics/PV3FoamReader/vtkPV3Foam/vtkPV3FoamMeshLagrangian.C
@@ -53,7 +53,7 @@ vtkPolyData* Foam::vtkPV3Foam::lagrangianVTKMesh
     if (debug)
     {
         Info<< "<beg> Foam::vtkPV3Foam::lagrangianVTKMesh - timePath "
-            << mesh.time().timePath()/cloud::subInstance/cloudName << endl;
+            << mesh.time().timePath()/cloud::prefix/cloudName << endl;
         printMemory();
     }
 
@@ -63,7 +63,7 @@ vtkPolyData* Foam::vtkPV3Foam::lagrangianVTKMesh
     (
         mesh,
         mesh.time().timeName(),
-        cloud::subInstance/cloudName
+        cloud::prefix/cloudName
     );
 
     IOobject* positionsPtr = sprayObjs.lookup("positions");
diff --git a/applications/utilities/postProcessing/graphics/PV3FoamReader/vtkPV3Foam/vtkPV3FoamUpdateInfo.C b/applications/utilities/postProcessing/graphics/PV3FoamReader/vtkPV3Foam/vtkPV3FoamUpdateInfo.C
index 0c8fd5bf2a..310a12efdf 100644
--- a/applications/utilities/postProcessing/graphics/PV3FoamReader/vtkPV3Foam/vtkPV3FoamUpdateInfo.C
+++ b/applications/utilities/postProcessing/graphics/PV3FoamReader/vtkPV3Foam/vtkPV3FoamUpdateInfo.C
@@ -149,16 +149,16 @@ void Foam::vtkPV3Foam::updateInfoLagrangian()
     if (debug)
     {
         Info<< "<beg> Foam::vtkPV3Foam::updateInfoLagrangian" << nl
-            << "    " << dbPtr_->timePath()/cloud::subInstance << endl;
+            << "    " << dbPtr_->timePath()/cloud::prefix << endl;
     }
 
 
     // use the db directly since this might be called without a mesh,
     // but the region must get added back in
-    fileName lagrangianPrefix(cloud::subInstance);
+    fileName lagrangianPrefix(cloud::prefix);
     if (meshRegion_ != polyMesh::defaultRegion)
     {
-        lagrangianPrefix = meshRegion_/cloud::subInstance;
+        lagrangianPrefix = meshRegion_/cloud::prefix;
     }
 
     // Search for list of lagrangian objects for this time
@@ -464,10 +464,10 @@ void Foam::vtkPV3Foam::updateInfoLagrangianFields()
 
     // use the db directly since this might be called without a mesh,
     // but the region must get added back in
-    fileName lagrangianPrefix(cloud::subInstance);
+    fileName lagrangianPrefix(cloud::prefix);
     if (meshRegion_ != polyMesh::defaultRegion)
     {
-        lagrangianPrefix = meshRegion_/cloud::subInstance;
+        lagrangianPrefix = meshRegion_/cloud::prefix;
     }
 
     IOobjectList objects
diff --git a/applications/utilities/postProcessing/graphics/ensightFoamReader/USERD_get_gold_part_build_info.H b/applications/utilities/postProcessing/graphics/ensightFoamReader/USERD_get_gold_part_build_info.H
index 6eb8c22a82..ca8da4727c 100644
--- a/applications/utilities/postProcessing/graphics/ensightFoamReader/USERD_get_gold_part_build_info.H
+++ b/applications/utilities/postProcessing/graphics/ensightFoamReader/USERD_get_gold_part_build_info.H
@@ -140,7 +140,7 @@ int USERD_get_gold_part_build_info
         strncpy
         (
             part_descriptions[nPatches+1],
-            cloud::subInstance.c_str(),
+            cloud::prefix.c_str(),
             Z_BUFL
         );
         number_of_elements[nPatches+1][Z_POINT] = sprayPtr->size();
diff --git a/applications/utilities/postProcessing/graphics/ensightFoamReader/USERD_set_filenames.H b/applications/utilities/postProcessing/graphics/ensightFoamReader/USERD_set_filenames.H
index e1f655cecb..83303fef71 100644
--- a/applications/utilities/postProcessing/graphics/ensightFoamReader/USERD_set_filenames.H
+++ b/applications/utilities/postProcessing/graphics/ensightFoamReader/USERD_set_filenames.H
@@ -164,7 +164,7 @@ int USERD_set_filenames
     (
         "positions",
         runTime.timeName(),
-        cloud::subInstance,
+        cloud::prefix,
         runTime,
         IOobject::NO_READ,
         IOobject::NO_WRITE,
@@ -179,7 +179,7 @@ int USERD_set_filenames
 
         sprayPtr = new Cloud<passiveParticle>(*meshPtr);
 
-        IOobjectList objects(*meshPtr, runTime.timeName(), cloud::subInstance);
+        IOobjectList objects(*meshPtr, runTime.timeName(), cloud::prefix);
 
         lagrangianScalarNames =
             (const wordList&)objects.names(sprayScalarFieldName);
diff --git a/applications/utilities/postProcessing/graphics/ensightFoamReader/getLagrangianScalar.H b/applications/utilities/postProcessing/graphics/ensightFoamReader/getLagrangianScalar.H
index 2093fd05af..39ccf6c07f 100644
--- a/applications/utilities/postProcessing/graphics/ensightFoamReader/getLagrangianScalar.H
+++ b/applications/utilities/postProcessing/graphics/ensightFoamReader/getLagrangianScalar.H
@@ -12,7 +12,7 @@ if (nVar >= 0)
         (
             name,
             runTime.timeName(),
-            cloud::subInstance,
+            cloud::prefix,
             mesh,
             IOobject::MUST_READ,
             IOobject::NO_WRITE
diff --git a/applications/utilities/postProcessing/graphics/ensightFoamReader/getLagrangianVector.H b/applications/utilities/postProcessing/graphics/ensightFoamReader/getLagrangianVector.H
index 9e41fe02c0..80c71ba028 100644
--- a/applications/utilities/postProcessing/graphics/ensightFoamReader/getLagrangianVector.H
+++ b/applications/utilities/postProcessing/graphics/ensightFoamReader/getLagrangianVector.H
@@ -14,7 +14,7 @@ if (nVar >= 0)
         (
             name,
             runTime.timeName(),
-            cloud::subInstance,
+            cloud::prefix,
             mesh,
             IOobject::MUST_READ,
             IOobject::NO_WRITE
diff --git a/applications/utilities/preProcessing/mapFields/MapLagrangianFields.H b/applications/utilities/preProcessing/mapFields/MapLagrangianFields.H
index 373b393eac..176a25f0f7 100644
--- a/applications/utilities/preProcessing/mapFields/MapLagrangianFields.H
+++ b/applications/utilities/preProcessing/mapFields/MapLagrangianFields.H
@@ -73,7 +73,7 @@ void MapLagrangianFields
             (
                 fieldIter()->name(),
                 meshTarget.time().timeName(),
-                cloud::subInstance/cloudName,
+                cloud::prefix/cloudName,
                 meshTarget,
                 IOobject::NO_READ,
                 IOobject::NO_WRITE,
diff --git a/applications/utilities/preProcessing/mapFields/mapLagrangian.C b/applications/utilities/preProcessing/mapFields/mapLagrangian.C
index fe5e1c70dd..9d04dcfbec 100644
--- a/applications/utilities/preProcessing/mapFields/mapLagrangian.C
+++ b/applications/utilities/preProcessing/mapFields/mapLagrangian.C
@@ -94,7 +94,7 @@ void mapLagrangian(const meshToMesh& meshToMeshInterp)
     (
         readDir
         (
-            meshSource.time().timePath()/cloud::subInstance,
+            meshSource.time().timePath()/cloud::prefix,
             fileName::DIRECTORY
         )
     );
@@ -106,7 +106,7 @@ void mapLagrangian(const meshToMesh& meshToMeshInterp)
         (
             meshSource,
             meshSource.time().timeName(),
-            cloud::subInstance/cloudDirs[cloudI]
+            cloud::prefix/cloudDirs[cloudI]
         );
 
         IOobject* positionsPtr = objects.lookup("positions");
diff --git a/src/OpenFOAM/fields/cloud/cloud.C b/src/OpenFOAM/fields/cloud/cloud.C
index 5dcb6f8328..f2dbb3be4f 100644
--- a/src/OpenFOAM/fields/cloud/cloud.C
+++ b/src/OpenFOAM/fields/cloud/cloud.C
@@ -31,7 +31,7 @@ License
 
 defineTypeNameAndDebug(Foam::cloud, 0);
 
-const Foam::word Foam::cloud::subInstance("lagrangian");
+const Foam::word Foam::cloud::prefix("lagrangian");
 Foam::word Foam::cloud::defaultName("defaultCloud");
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
@@ -44,7 +44,7 @@ Foam::cloud::cloud(const objectRegistry& obr, const word& cloudName)
         (
             ( cloudName.size() ? cloudName : defaultName ),
             obr.time().timeName(),
-            subInstance,
+            prefix,
             obr,
             IOobject::NO_READ,
             IOobject::AUTO_WRITE
diff --git a/src/OpenFOAM/fields/cloud/cloud.H b/src/OpenFOAM/fields/cloud/cloud.H
index 0891255d14..0c0915464e 100644
--- a/src/OpenFOAM/fields/cloud/cloud.H
+++ b/src/OpenFOAM/fields/cloud/cloud.H
@@ -69,8 +69,8 @@ public:
     //- Runtime type information
     TypeName("cloud");
 
-        //- The subInstance (local) to prefix: %lagrangian
-        static const word subInstance;
+        //- The prefix to local: %lagrangian
+        static const word prefix;
 
         //- The default cloud name: %defaultCloud
         static word defaultName;
diff --git a/src/surfMesh/MeshedSurfaceProxy/MeshedSurfaceProxy.C b/src/surfMesh/MeshedSurfaceProxy/MeshedSurfaceProxy.C
index 0a27c9ac09..d9ba96704b 100644
--- a/src/surfMesh/MeshedSurfaceProxy/MeshedSurfaceProxy.C
+++ b/src/surfMesh/MeshedSurfaceProxy/MeshedSurfaceProxy.C
@@ -108,7 +108,7 @@ void Foam::MeshedSurfaceProxy<Face>::write
     // the local location
     const fileName objectDir
     (
-        t.timePath()/surfaceRegistry::subInstance/name/surfMesh::meshSubDir
+        t.timePath()/surfaceRegistry::prefix/name/surfMesh::meshSubDir
     );
 
     if (!isDir(objectDir))
diff --git a/src/surfMesh/surfaceFormats/surfaceFormatsCore.C b/src/surfMesh/surfaceFormats/surfaceFormatsCore.C
index 65d71b252b..3c5a8a7344 100644
--- a/src/surfMesh/surfaceFormats/surfaceFormatsCore.C
+++ b/src/surfMesh/surfaceFormats/surfaceFormatsCore.C
@@ -62,9 +62,7 @@ Foam::fileFormats::surfaceFormatsCore::localMeshFileName(const word& surfName)
 
     return fileName
     (
-        surfaceRegistry::subInstance
-      / name
-      / surfMesh::meshSubDir
+        surfaceRegistry::prefix/name/surfMesh::meshSubDir
       / name + "." + nativeExt
     );
 }
diff --git a/src/surfMesh/surfaceRegistry/surfaceRegistry.C b/src/surfMesh/surfaceRegistry/surfaceRegistry.C
index 335acfff0d..ed0460cdf0 100644
--- a/src/surfMesh/surfaceRegistry/surfaceRegistry.C
+++ b/src/surfMesh/surfaceRegistry/surfaceRegistry.C
@@ -31,7 +31,7 @@ License
 
 defineTypeNameAndDebug(Foam::surfaceRegistry, 0);
 
-const Foam::word Foam::surfaceRegistry::subInstance("surfaces");
+const Foam::word Foam::surfaceRegistry::prefix("surfaces");
 Foam::word Foam::surfaceRegistry::defaultName("default");
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
@@ -48,7 +48,7 @@ Foam::surfaceRegistry::surfaceRegistry
         (
             ( surfName.size() ? surfName : defaultName ),
             obr.time().timeName(),
-            subInstance,
+            prefix,
             obr,
             IOobject::NO_READ,
             IOobject::NO_WRITE
diff --git a/src/surfMesh/surfaceRegistry/surfaceRegistry.H b/src/surfMesh/surfaceRegistry/surfaceRegistry.H
index fa4bad64ea..11e0225506 100644
--- a/src/surfMesh/surfaceRegistry/surfaceRegistry.H
+++ b/src/surfMesh/surfaceRegistry/surfaceRegistry.H
@@ -66,8 +66,8 @@ public:
     //- Runtime type information
     TypeName("surfaceRegistry");
 
-        //- The subInstance (local) to prefix: %surfaces
-        static const word subInstance;
+        //- The prefix to local: %surfaces
+        static const word prefix;
 
         //- The default surface name: %default
         static word defaultName;