diff --git a/src/OpenFOAM/meshes/polyMesh/zones/ZoneMesh/ZoneMesh.C b/src/OpenFOAM/meshes/polyMesh/zones/ZoneMesh/ZoneMesh.C
index 8c1e0cd003..e0d75e7e69 100644
--- a/src/OpenFOAM/meshes/polyMesh/zones/ZoneMesh/ZoneMesh.C
+++ b/src/OpenFOAM/meshes/polyMesh/zones/ZoneMesh/ZoneMesh.C
@@ -307,6 +307,13 @@ Foam::wordList Foam::ZoneMesh<ZoneType, MeshType>::names() const
 }
 
 
+template<class ZoneType, class MeshType>
+Foam::wordList Foam::ZoneMesh<ZoneType, MeshType>::groupNames() const
+{
+    return this->groupZoneIDs().sortedToc();
+}
+
+
 template<class ZoneType, class MeshType>
 Foam::wordList Foam::ZoneMesh<ZoneType, MeshType>::names
 (
diff --git a/src/OpenFOAM/meshes/polyMesh/zones/ZoneMesh/ZoneMesh.H b/src/OpenFOAM/meshes/polyMesh/zones/ZoneMesh/ZoneMesh.H
index a97d172a7b..8fbeca0d2c 100644
--- a/src/OpenFOAM/meshes/polyMesh/zones/ZoneMesh/ZoneMesh.H
+++ b/src/OpenFOAM/meshes/polyMesh/zones/ZoneMesh/ZoneMesh.H
@@ -159,6 +159,9 @@ public:
         //- A list of the zone names
         wordList names() const;
 
+        //- A list of the zone group names (if any)
+        wordList groupNames() const;
+
         //- A list of zone names satisfying the input matcher
         wordList names(const wordRe& matcher) const;
 
diff --git a/src/OpenFOAM/meshes/polyMesh/zones/zone/zone.C b/src/OpenFOAM/meshes/polyMesh/zones/zone/zone.C
index 77190fef48..67e400cef3 100644
--- a/src/OpenFOAM/meshes/polyMesh/zones/zone/zone.C
+++ b/src/OpenFOAM/meshes/polyMesh/zones/zone/zone.C
@@ -6,7 +6,7 @@
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
     Copyright (C) 2011-2016 OpenFOAM Foundation
-    Copyright (C) 2017-2021 OpenCFD Ltd.
+    Copyright (C) 2017-2022 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -92,7 +92,9 @@ Foam::zone::zone
     const label index
 )
 :
-    zone(name, dict.get<labelList>(labelsName), index)
+    zoneIdentifier(name, dict, index),
+    labelList(dict.get<labelList>(labelsName)),
+    lookupMapPtr_(nullptr)
 {}