How can i get facebook to let me make my nickname texas?

When i try to make it my nickname, it says that is has been disapproved by the automated system. Is there anyway to get past the system?|||When i try to make it my nickname, it says that is has been disapproved by the automated system. Is there anyway to get past the system?|||Ask some one with the nick name Face book, lol, no i dnt know.