The only way a user can change his/her username is by requesting it from Admin. If Admin grant the change of name then all they would have to do is to add the previous name to the disallowed usernames list in vb options to stop anyone else from registering under that name.
That's how it was in version 3.5.4 so I assume it hasn't changed in the following versions, I haven't had to change a username since using 3.5.4
Tinks
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