Name changes have one critical flaw that would need to be handled, even then there might be a little confusion.

Folks can change them into things completely different, which can help disguise someone who's flat out trying to not be good in roleplays and use this means to further expand their "works", and then you have onesthat like to change their names constatnly - making identification an obnoxious process as you try to reference somebody who changed their name two hours ago.