None.
Then you'd have to transfer the join date, posts started, threads started, groups started, friends, visitors ... etc.
I'm a member of an entertainer's forum that gets around all this by allowing members to change their display names up to once a month (everyone logs in under their original username) as easily as we change user titles here. It can be fun and amusing; but, is better suited to superfluous entertainment forums. It can be confusing and easily abused when the going gets serious (even when display name histories are available through user controls).
Here, a display name change should be more important to the user, for whatever reason, than any of the aforementioned [1st paragraph] considerations before it is effected.
Been there, done that: congratulations Pete.
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