Even though I always wanted to get my hands on the clean Void in-game name, it's not fair at all to just wipe names, even if you give warnings beforehand. Server merges aside, I don't believe the company should ever go as far as modifying user data.
Unique identifiers like Discord's are mostly implemented for very large user bases and, besides that, the games has monetized on name changing since forever and some people had spent really serious money on that.