diff --git a/lib/pages/space_management_v2/main_module/helpers/spaces_recursive_helper.dart b/lib/pages/space_management_v2/main_module/helpers/spaces_recursive_helper.dart
index de5ce34f..96d019ae 100644
--- a/lib/pages/space_management_v2/main_module/helpers/spaces_recursive_helper.dart
+++ b/lib/pages/space_management_v2/main_module/helpers/spaces_recursive_helper.dart
@@ -68,4 +68,20 @@ abstract final class SpacesRecursiveHelper {
       return space;
     }).toList();
   }
+
+  static SpaceModel? findParent(
+    List<SpaceModel> spaces,
+    String targetUuid,
+  ) {
+    for (final space in spaces) {
+      if (space.children.any((child) => child.uuid == targetUuid)) {
+        return space;
+      }
+      final parent = findParent(space.children, targetUuid);
+      if (parent != null) {
+        return parent;
+      }
+    }
+    return null;
+  }
 }
diff --git a/lib/pages/space_management_v2/main_module/widgets/community_structure_header_action_buttons_composer.dart b/lib/pages/space_management_v2/main_module/widgets/community_structure_header_action_buttons_composer.dart
index b2a41274..0cb56bc5 100644
--- a/lib/pages/space_management_v2/main_module/widgets/community_structure_header_action_buttons_composer.dart
+++ b/lib/pages/space_management_v2/main_module/widgets/community_structure_header_action_buttons_composer.dart
@@ -49,8 +49,8 @@ class CommunityStructureHeaderActionButtonsComposer extends StatelessWidget {
         context: context,
         builder: (_) => DuplicateSpaceDialog(
           initialName: space.spaceName,
-          selectedSpaceUuid: space.uuid,
-          selectedCommunityUuid: selectedCommunity.uuid,
+          selectedSpace: space,
+          selectedCommunity: selectedCommunity,
           onSuccess: (spaces) {
             final updatedCommunity = selectedCommunity.copyWith(
               spaces: spaces,
diff --git a/lib/pages/space_management_v2/modules/duplicate_space/presentation/views/duplicate_space_dialog.dart b/lib/pages/space_management_v2/modules/duplicate_space/presentation/views/duplicate_space_dialog.dart
index 2083bf62..8f4ddf90 100644
--- a/lib/pages/space_management_v2/modules/duplicate_space/presentation/views/duplicate_space_dialog.dart
+++ b/lib/pages/space_management_v2/modules/duplicate_space/presentation/views/duplicate_space_dialog.dart
@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:syncrow_web/common/widgets/app_loading_indicator.dart';
+import 'package:syncrow_web/pages/space_management_v2/modules/communities/domain/models/community_model.dart';
 import 'package:syncrow_web/pages/space_management_v2/modules/communities/domain/models/space_model.dart';
 import 'package:syncrow_web/pages/space_management_v2/modules/duplicate_space/data/services/remote_duplicate_space_service.dart';
 import 'package:syncrow_web/pages/space_management_v2/modules/duplicate_space/presentation/bloc/duplicate_space_bloc.dart';
@@ -12,15 +13,15 @@ class DuplicateSpaceDialog extends StatelessWidget {
   const DuplicateSpaceDialog({
     required this.initialName,
     required this.onSuccess,
-    required this.selectedSpaceUuid,
-    required this.selectedCommunityUuid,
+    required this.selectedSpace,
+    required this.selectedCommunity,
     super.key,
   });
 
   final String initialName;
   final void Function(List<SpaceModel> spaces) onSuccess;
-  final String selectedSpaceUuid;
-  final String selectedCommunityUuid;
+  final SpaceModel selectedSpace;
+  final CommunityModel selectedCommunity;
 
   @override
   Widget build(BuildContext context) {
@@ -31,10 +32,10 @@ class DuplicateSpaceDialog extends StatelessWidget {
       child: BlocListener<DuplicateSpaceBloc, DuplicateSpaceState>(
         listener: _listener,
         child: DuplicateSpaceDialogForm(
-          initialNameSuffix: '(1)',
-          initialName: initialName,
-          selectedSpaceUuid: selectedSpaceUuid,
-          selectedCommunityUuid: selectedCommunityUuid,
+          initialName: _getInitialName(),
+          selectedSpaceUuid: selectedSpace.uuid,
+          selectedCommunityUuid: selectedCommunity.uuid,
+          siblingNames: _getSiblingNames(),
         ),
       ),
     );
@@ -67,4 +68,69 @@ class DuplicateSpaceDialog extends StatelessWidget {
         break;
     }
   }
+
+  List<SpaceModel> _findSiblings(
+    List<SpaceModel> spaces,
+    String targetUuid,
+  ) {
+    final parent = _findParent(spaces, targetUuid);
+
+    if (parent != null) {
+      return parent.children.where((s) => s.uuid != targetUuid).toList();
+    } else {
+      if (spaces.any((s) => s.uuid == targetUuid)) {
+        return spaces.where((s) => s.uuid != targetUuid).toList();
+      }
+    }
+    return [];
+  }
+
+  SpaceModel? _findParent(List<SpaceModel> allSpaces, String childUuid) {
+    for (final space in allSpaces) {
+      if (space.children.any((child) => child.uuid == childUuid)) {
+        return space;
+      }
+      final parent = _findParent(space.children, childUuid);
+      if (parent != null) {
+        return parent;
+      }
+    }
+    return null;
+  }
+
+  List<String> _getSiblingNames() {
+    final siblings = _findSiblings(selectedCommunity.spaces, selectedSpace.uuid);
+    final names = siblings.map((s) => s.spaceName).toList();
+    names.add(initialName);
+    return names;
+  }
+
+  String _getInitialName() {
+    final allRelevantNames = _getSiblingNames();
+    final nameRegex = RegExp(r'^(.*?) ?\((\d+)\)$');
+
+    final baseNameMatch = nameRegex.firstMatch(initialName);
+    final baseName = baseNameMatch?.group(1)?.trim() ?? initialName;
+
+    var maxSuffix = 0;
+
+    for (final name in allRelevantNames) {
+      if (name == baseName) {
+        continue;
+      }
+
+      final match = nameRegex.firstMatch(name);
+      if (match != null) {
+        final currentBaseName = match.group(1)!.trim();
+        if (currentBaseName == baseName) {
+          final suffix = int.parse(match.group(2)!);
+          if (suffix > maxSuffix) {
+            maxSuffix = suffix;
+          }
+        }
+      }
+    }
+
+    return '$baseName(${maxSuffix + 1})';
+  }
 }
diff --git a/lib/pages/space_management_v2/modules/duplicate_space/presentation/widgets/duplicate_space_dialog_form.dart b/lib/pages/space_management_v2/modules/duplicate_space/presentation/widgets/duplicate_space_dialog_form.dart
index bac1cecd..db3cc878 100644
--- a/lib/pages/space_management_v2/modules/duplicate_space/presentation/widgets/duplicate_space_dialog_form.dart
+++ b/lib/pages/space_management_v2/modules/duplicate_space/presentation/widgets/duplicate_space_dialog_form.dart
@@ -11,14 +11,14 @@ class DuplicateSpaceDialogForm extends StatefulWidget {
     required this.initialName,
     required this.selectedSpaceUuid,
     required this.selectedCommunityUuid,
-    required this.initialNameSuffix,
+    required this.siblingNames,
     super.key,
   });
 
   final String initialName;
   final String selectedSpaceUuid;
   final String selectedCommunityUuid;
-  final String initialNameSuffix;
+  final List<String> siblingNames;
 
   @override
   State<DuplicateSpaceDialogForm> createState() => _DuplicateSpaceDialogFormState();
@@ -26,20 +26,33 @@ class DuplicateSpaceDialogForm extends StatefulWidget {
 
 class _DuplicateSpaceDialogFormState extends State<DuplicateSpaceDialogForm> {
   late final TextEditingController _nameController;
-  bool _isNameValid = true;
+  String? _errorText;
 
   @override
   void initState() {
     super.initState();
     _nameController = TextEditingController(
-      text: '${widget.initialName}${widget.initialNameSuffix}',
+      text: widget.initialName,
     );
     _nameController.addListener(_validateName);
   }
 
-  void _validateName() => setState(
-        () => _isNameValid = _nameController.text.trim() != widget.initialName,
-      );
+  void _validateName() {
+    final name = _nameController.text.trim();
+    if (name.isEmpty) {
+      setState(() {
+        _errorText = 'Name cannot be empty';
+      });
+    } else if (widget.siblingNames.contains(name)) {
+      setState(() {
+        _errorText = 'Name must be unique';
+      });
+    } else {
+      setState(() {
+        _errorText = null;
+      });
+    }
+  }
 
   @override
   void dispose() {
@@ -66,15 +79,15 @@ class _DuplicateSpaceDialogFormState extends State<DuplicateSpaceDialogForm> {
           const SelectableText('Enter a new name for the duplicated space:'),
           DuplicateSpaceTextField(
             nameController: _nameController,
-            isNameValid: _isNameValid,
-            initialName: widget.initialName,
+            isNameValid: _errorText == null,
+            errorText: _errorText,
           ),
         ],
       ),
       actions: [
         SpaceDetailsActionButtons(
           spacerFlex: 2,
-          onSave: _isNameValid ? () => _submit(context) : null,
+          onSave: _errorText == null ? () => _submit(context) : null,
           onCancel: Navigator.of(context).pop,
           saveButtonLabel: 'Duplicate',
         ),
diff --git a/lib/pages/space_management_v2/modules/duplicate_space/presentation/widgets/duplicate_space_text_field.dart b/lib/pages/space_management_v2/modules/duplicate_space/presentation/widgets/duplicate_space_text_field.dart
index 828e72f0..8d8bfe64 100644
--- a/lib/pages/space_management_v2/modules/duplicate_space/presentation/widgets/duplicate_space_text_field.dart
+++ b/lib/pages/space_management_v2/modules/duplicate_space/presentation/widgets/duplicate_space_text_field.dart
@@ -6,15 +6,13 @@ class DuplicateSpaceTextField extends StatelessWidget {
   const DuplicateSpaceTextField({
     required this.nameController,
     required this.isNameValid,
-    required this.initialName,
+    this.errorText,
     super.key,
   });
 
   final TextEditingController nameController;
   final bool isNameValid;
-  final String initialName;
-
-  String get _errorText => 'Name must be different from "$initialName"';
+  final String? errorText;
 
   @override
   Widget build(BuildContext context) {
@@ -35,7 +33,7 @@ class DuplicateSpaceTextField extends StatelessWidget {
           color: context.theme.colorScheme.error,
           fontSize: 8,
         ),
-        errorText: isNameValid ? null : _errorText,
+        errorText: isNameValid ? null : errorText,
       ),
     );
   }