Merge pull request #1842 from syncfusion-content/988332-RulesForNamedRange

988332-FAQ for what are the naming rules for named ranges in Excel

Author: Mohan2401

Document-Processing/Excel/Excel-Library/NET/faqs/what-are-the-naming-rules-for-named-ranges-in-Excel.md

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+---
+title: Naming rules for named ranges in Excel | Syncfusion
+description: Learn the naming conventions for Excel named ranges in XlsIO, including allowed characters, restrictions, and length limits.
+platform: document-processing
+control: XlsIO
+documentation: UG
+---
+
+# What are the naming rules for named ranges in Excel?
+
+When defining a named range in Excel, the following rules apply:
+
+* **Start character:** Must begin with a letter (A-Z/a-z), underscore (_), or backslash (\).
+
+* **Allowed characters:** Can include letters, numbers, underscores (_), and periods (.).
+
+* **Characters not allowed:** Spaces and most special characters (e.g., ! @ # $ % ^ & *) are not permitted.
+
+* **No cell references:** Names cannot resemble a valid cell reference (e.g., A1, R1C1).
+
+* **Length limit:** Maximum of 255 characters.
+
+* **Case sensitivity:** Names are case-insensitive.