diff --git a/src/main/java/org/gridsuite/studyconfig/server/service/SpreadsheetConfigService.java b/src/main/java/org/gridsuite/studyconfig/server/service/SpreadsheetConfigService.java
index 31d3863..c5bd1ce 100644
--- a/src/main/java/org/gridsuite/studyconfig/server/service/SpreadsheetConfigService.java
+++ b/src/main/java/org/gridsuite/studyconfig/server/service/SpreadsheetConfigService.java
@@ -8,6 +8,7 @@
 
 import jakarta.persistence.EntityNotFoundException;
 import lombok.RequiredArgsConstructor;
+import org.apache.commons.lang3.tuple.Pair;
 import org.gridsuite.studyconfig.server.dto.*;
 import org.gridsuite.studyconfig.server.entities.ColumnEntity;
 import org.gridsuite.studyconfig.server.entities.GlobalFilterEntity;
@@ -371,6 +372,38 @@ private static void reorderColumns(List<UUID> columnOrder, List<ColumnEntity> co
         columns.sort(Comparator.comparingInt(column -> columnOrder.indexOf(column.getUuid())));
     }
 
+    private String newCandidate(String base, int n) {
+        return base + '_' + n;
+    }
+
+    /**
+     * Generates a unique value by appending a numeric suffix if the original value already exists.
+     *
+     * @param originalValue  the original value to make unique
+     * @param existingValues set of existing values to avoid conflicts with
+     * @return a unique value, either the original or with a numeric suffix
+     */
+    private String getUniqueValue(String originalValue, Set<String> existingValues) {
+        if (!existingValues.contains(originalValue)) {
+            return originalValue;
+        }
+
+        int i = 1;
+        while (existingValues.contains(newCandidate(originalValue, i))) {
+            ++i;
+        }
+        return newCandidate(originalValue, i);
+    }
+
+    private Pair<String, String> getDuplicateIdAndNameCandidate(SpreadsheetConfigEntity entity, String columnId, String columnName) {
+        var existingColumnIds = entity.getColumns().stream().map(ColumnEntity::getId).collect(Collectors.toSet());
+        var existingColumnNames = entity.getColumns().stream().map(ColumnEntity::getName).collect(Collectors.toSet());
+        String newColumnId = getUniqueValue(columnId, existingColumnIds);
+        String newColumnName = getUniqueValue(columnName, existingColumnNames);
+
+        return Pair.of(newColumnId, newColumnName);
+    }
+
     @Transactional
     public void duplicateColumn(UUID id, UUID columnId) {
         SpreadsheetConfigEntity entity = findEntityById(id);
@@ -378,9 +411,9 @@ public void duplicateColumn(UUID id, UUID columnId) {
                 .findFirst().orElseThrow(() -> new EntityNotFoundException(COLUMN_NOT_FOUND + columnId));
         ColumnEntity columnCopy = columnEntity.toBuilder().build();
         columnCopy.setUuid(UUID.randomUUID());
-        columnCopy.setId(columnCopy.getId() + "copy");
-        columnCopy.setName(columnCopy.getName() + "-copy");
-
+        Pair<String, String> idAndName = getDuplicateIdAndNameCandidate(entity, columnCopy.getId(), columnCopy.getName());
+        columnCopy.setId(idAndName.getLeft());
+        columnCopy.setName(idAndName.getRight());
         List<ColumnEntity> columns = entity.getColumns();
         columns.add(columns.indexOf(columnEntity) + 1, columnCopy);
         entity.setColumns(columns);
diff --git a/src/test/java/org/gridsuite/studyconfig/server/SpreadsheetConfigIntegrationTest.java b/src/test/java/org/gridsuite/studyconfig/server/SpreadsheetConfigIntegrationTest.java
index b41b8d4..7d0019b 100644
--- a/src/test/java/org/gridsuite/studyconfig/server/SpreadsheetConfigIntegrationTest.java
+++ b/src/test/java/org/gridsuite/studyconfig/server/SpreadsheetConfigIntegrationTest.java
@@ -30,6 +30,7 @@
 import java.util.stream.Collectors;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
 
@@ -328,12 +329,22 @@ void testDuplicateColumn() throws Exception {
         ColumnInfos duplicatedColumnInfos = configAfterDuplicate.columns().get(1);
 
         assertThat(columnInfos.uuid()).isNotEqualTo(duplicatedColumnInfos.uuid());
-        assertThat(columnInfos.id()).isNotEqualTo(duplicatedColumnInfos.id());
+        assertEquals(columnInfos.id() + "_1", duplicatedColumnInfos.id());
+        assertEquals(columnInfos.name() + "_1", duplicatedColumnInfos.name());
         assertThat(columnInfos.visible()).isEqualTo(duplicatedColumnInfos.visible());
         assertThat(columnInfos.formula()).isEqualTo(duplicatedColumnInfos.formula());
         assertThat(columnInfos.dependencies()).isEqualTo(duplicatedColumnInfos.dependencies());
         assertThat(columnInfos.precision()).isEqualTo(duplicatedColumnInfos.precision());
 
+        mockMvc.perform(post(URI_SPREADSHEET_CONFIG_GET_PUT + configId + URI_COLUMN_BASE + "/" + columnId + "/duplicate"))
+                .andExpect(status().isNoContent());
+        configAfterDuplicate = getSpreadsheetConfig(configId);
+        assertThat(configAfterDuplicate.columns()).hasSize(6);
+        duplicatedColumnInfos = configAfterDuplicate.columns().get(1);
+        assertThat(columnInfos.uuid()).isNotEqualTo(duplicatedColumnInfos.uuid());
+        assertEquals(columnInfos.id() + "_2", duplicatedColumnInfos.id());
+        assertEquals(columnInfos.name() + "_2", duplicatedColumnInfos.name());
+
         mockMvc.perform(post(URI_SPREADSHEET_CONFIG_GET_PUT + configId + URI_COLUMN_BASE + "/" + UUID.randomUUID() + "/duplicate"))
                 .andExpect(status().isNotFound());
     }