I am only speaking for myself, the other admins may have a different policy.

I will no longer do any changes of user names, unless the member has a very valid reason, such as:

Change of marital status

Change of religious preference

They have had the old name for over one year

The old name has negative meanings that were not known at the time the name was chosen.

If for some reason I do get talked into changing a name for vanity purposes, the name change will be accompanied by a removal of all existing reps, etc. and the member will be reduced to limited membership until they get 50 new posts.