Choose Name Dialog Box (Visual Database Tools)
This dialog box appears when you choose Save <TableName> , Save <DiagramName>, or Save <ViewName> from the File menu.
You can not change a view's name later. You can change a table's name later, but it is best if you make any name changes now. Changing the name of an existing table is risky, because you can invalidate other objects that refer to that table by name.