If the Caption property has been set for a field, the text displayed in the field selector might be different from the actual field name. If you rename a field with a caption while in Datasheet view, the caption will be deleted and replaced with the field name. To avoid deleting a caption, rename the field in Design view.
Rename a field in a table in Design view
Important If you have expressions or Microsoft Visual Basic for Applications code that contains references to a field whose name you are changing, you must update all of those references to the new name.
Rename a field in a table in Datasheet view
Important If you have expressions or Microsoft Visual Basic for Applications code that contains references to a field whose name you are changing, you must update all of those references to the new name.
Change the field (column) name that appears in a datasheet