There is a link from your individual account profile to put in a name change request in a queue accessed only through the ACP.
When an admin goes into that queue, the system tells us if it is the first name change for the account, and if not, it will tell us all of the prior name changes and we can approve or not approve the request.
There is a name change history that shows up in several different ways, some used by the account holder, and some by admin/mods.
So the name history information is available, and admin can provide that information if necessary.
I would prefer however that all name change requests use the queue and not be posted as admin requests.