Description
Any database may have naming restrictions for table and field names. For instance, a table in a file geodatabase cannot start with a number or a special character such as an asterisk (*) or percent sign (%).
Solution
Alter the name to remove the invalid first character. ArcPy methods exist that allow you to validate table and field names. Consider using either the ValidateTableName or ValidateFieldName function to ensure your name is valid. Learn more about validating table and field names