Feel like that might be a tad easy now seeing as it seems that you can't hide name changes anymore.
Terraria Community Forums
Techhunter_Talon
Streyll
Where would you not be able to hide past usernames? I haven't ever been able to see any list of past usernames on profiles, unless a person specifically posts who they used to be. I've also heard a lot of people complain that past usernames are only visible to the person that changed them.
Ivyss
What do you mean you can't hide name changes anymore? They're specifically hidden from eveyone but the user themself. (And I'd imagine forum staff can see them as well.)
Kit Da Percussionist
Okay then, what was one of my old usernames?