How to Change Your Name on Facebook
Facebook requires that all members submit a full first and last name to the site when they sign up. Your name is attached to all comments, posts and private messages you leave using your account. If you change your name in real life, or decide to use a nickname that is derived from your real name, Facebook permits you to alter the name on your account. A Facebook employee must review and approve all name change requests.
Go to the "Account" link located in the top-right corner of the blue banner atop every Facebook page.
Select "Account Settings" from the drop-down menu.
Click on the blue "Change" link on the far-right side of the "Name" line, located at the top of the page.
Highlight the content currently in the "First Name" and "Last Name" fields and hit "Delete."
Enter your new name information in the fields and click "Save Changes" to confirm your new name. Facebook will review your name change submission within 24 hours.