diff --git a/ClosedXML/Excel/PivotTables/XLPivotTable.cs b/ClosedXML/Excel/PivotTables/XLPivotTable.cs
index 80124a0..5985ed4 100644
--- a/ClosedXML/Excel/PivotTables/XLPivotTable.cs
+++ b/ClosedXML/Excel/PivotTables/XLPivotTable.cs
@@ -44,44 +44,6 @@
 
         public IXLPivotTable SetTheme(XLPivotTableTheme value) { Theme = value; return this; }
 
-        private Boolean ValidateName(String newName, String oldName, out String message)
-        {
-            message = "";
-            if (String.IsNullOrWhiteSpace(newName))
-            {
-                message = $"The table name '{newName}' is invalid";
-                return false;
-            }
-
-            // Table names are case insensitive
-            if (!oldName.Equals(newName, StringComparison.OrdinalIgnoreCase)
-                && Worksheet.Tables.Any(t => t.Name.Equals(newName, StringComparison.OrdinalIgnoreCase)))
-            {
-                message = $"This worksheet already contains a table named '{newName}'";
-                return false;
-            }
-
-            if (newName[0] != '_' && !char.IsLetter(newName[0]))
-            {
-                message = $"The table name '{newName}' does not begin with a letter or an underscore";
-                return false;
-            }
-
-            if (newName.Length > 255)
-            {
-                message = "The table name is more than 255 characters";
-                return false;
-            }
-
-            if (new[] { 'C', 'R' }.Any(c => newName.ToUpper().Equals(c.ToString())))
-            {
-                message = $"The table name '{newName}' is invalid";
-                return false;
-            }
-
-            return true;
-        }
-
         public String Name
         {
             get { return _name; }
@@ -91,7 +53,7 @@
 
                 var oldname = _name ?? string.Empty;
 
-                if (!ValidateName(value, oldname, out String message))
+                if (!XLHelper.ValidateName("pivot table", value, oldname, Worksheet.PivotTables.Select(pvt => pvt.Name), out String message))
                     throw new ArgumentException(message, nameof(value));
 
                 _name = value;
diff --git a/ClosedXML/Excel/Tables/XLTable.cs b/ClosedXML/Excel/Tables/XLTable.cs
index 73df4a2..e37e473 100644
--- a/ClosedXML/Excel/Tables/XLTable.cs
+++ b/ClosedXML/Excel/Tables/XLTable.cs
@@ -201,44 +201,6 @@
 
         public XLTableTheme Theme { get; set; }
 
-        private Boolean ValidateName(String newName, String oldName, out String message)
-        {
-            message = "";
-            if (String.IsNullOrWhiteSpace(newName))
-            {
-                message = $"The table name '{newName}' is invalid";
-                return false;
-            }
-
-            // Table names are case insensitive
-            if (!oldName.Equals(newName, StringComparison.OrdinalIgnoreCase)
-                && Worksheet.Tables.Any(t => t.Name.Equals(newName, StringComparison.OrdinalIgnoreCase)))
-            {
-                message = $"This worksheet already contains a table named '{newName}'";
-                return false;
-            }
-
-            if (newName[0] != '_' && !char.IsLetter(newName[0]))
-            {
-                message = $"The table name '{newName}' does not begin with a letter or an underscore";
-                return false;
-            }
-
-            if (newName.Length > 255)
-            {
-                message = "The table name is more than 255 characters";
-                return false;
-            }
-
-            if (new[] { 'C', 'R' }.Any(c => newName.ToUpper().Equals(c.ToString())))
-            {
-                message = $"The table name '{newName}' is invalid";
-                return false;
-            }
-
-            return true;
-        }
-
         public String Name
         {
             get { return _name; }
@@ -249,7 +211,7 @@
                 // Validation rules for table names
                 var oldname = _name ?? string.Empty;
 
-                if (!ValidateName(value, oldname, out String message))
+                if (!XLHelper.ValidateName("table", value, oldname, Worksheet.Tables.Select(t => t.Name), out String message))
                     throw new ArgumentException(message, nameof(value));
 
                 _name = value;
diff --git a/ClosedXML/XLHelper.cs b/ClosedXML/XLHelper.cs
index 43aa729..0b8b156 100644
--- a/ClosedXML/XLHelper.cs
+++ b/ClosedXML/XLHelper.cs
@@ -1,6 +1,6 @@
 using System;
-using System.Drawing;
 using System.Collections.Generic;
+using System.Drawing;
 using System.Globalization;
 using System.Linq;
 using System.Text.RegularExpressions;
@@ -19,7 +19,7 @@
         public const String MaxColumnLetter = "XFD";
         public const Double Epsilon = 1e-10;
 
-        private const Int32 TwoT26 = 26*26;
+        private const Int32 TwoT26 = 26 * 26;
 
         internal static readonly Graphics Graphic = Graphics.FromImage(new Bitmap(200, 200));
         internal static readonly Double DpiX = Graphic.DpiX;
@@ -101,7 +101,6 @@
             throw new ArgumentOutOfRangeException(columnLetter + " is not recognized as a column letter");
         }
 
-
         /// <summary>
         /// Gets the column letter of a given column number.
         /// </summary>
@@ -320,5 +319,43 @@
         {
             return -657435 <= d && d < 2958466;
         }
+
+        public static Boolean ValidateName(String objectType, String newName, String oldName, IEnumerable<String> existingNames, out String message)
+        {
+            message = "";
+            if (String.IsNullOrWhiteSpace(newName))
+            {
+                message = $"The {objectType} name '{newName}' is invalid";
+                return false;
+            }
+
+            // Table names are case insensitive
+            if (!oldName.Equals(newName, StringComparison.OrdinalIgnoreCase)
+                && existingNames.Contains(newName, StringComparer.OrdinalIgnoreCase))
+            {
+                message = $"There is already a {objectType} named '{newName}'";
+                return false;
+            }
+
+            if (newName[0] != '_' && !char.IsLetter(newName[0]))
+            {
+                message = $"The {objectType} name '{newName}' does not begin with a letter or an underscore";
+                return false;
+            }
+
+            if (newName.Length > 255)
+            {
+                message = $"The {objectType} name is more than 255 characters";
+                return false;
+            }
+
+            if (new[] { 'C', 'R' }.Any(c => newName.ToUpper().Equals(c.ToString())))
+            {
+                message = $"The {objectType} name '{newName}' is invalid";
+                return false;
+            }
+
+            return true;
+        }
     }
 }