Assuming you are using Word then you can change the name associated with Word itself. If you are using Word 2003 then go to the Tools menu, click Options, and then click the User Information tab. In the Name box, type your name or change the current name to your name.
For Word 2007 click the Microsoft Office Button and then click Word Options. Next click on Popular. Finally under Personalize your copy of Office, type your name in the User name box.
For Word 2010 and up click on the File tab and then Options. Under the General section where it says Personalize your copy of Microsoft Office you can put your name in the User name box.