No, the request to change your name from your initial name to a new name, the requirements that you submit are official on this forum, you have to pass several requirements to fulfill the request for a name change
Official requirements? The only official rule we have about username change is that "
You can either donate 50 BTC to become a VIP or PM theymos asking to change your username (although he rarely accepts such requests nowadays)."
First you have to reach the Legendary position first and have the best contribution in this forum. If you only know about Bounty, don't expect your new name to be granted.
There is no rule saying you have to be a legendary member to request a username change. The final decision is made by theymos.