why can't i use facebook user name that is not taken?

[Ahmed Ahmed Said]

when i try to make facebook user name ahmedahmedsaid i find it taken but when i try to access the timeline with this user name it redirect me to profile with extra dote ahmedahmed.said how can i fix that and have the user name wanted??!

[abraXus]

you cant

someone already used that name, or facebook made it not possible for you to use

choose another

[Daniel]

You Cant the Username Probably has Been Used Already its Possible that the Profile is on Deactivated Mode Even tho the Profile is Offline the Username still Exists