Mine is Cryomatrix.
When I first started playing online games way back in the day. I thought of something cool and I was working in a biological research lab with cryo freezers and I combined two words that I thought sounded cool.
Cryo + Matrix
I have a feeling some people think my name is Cry + O + Matrix but it's Cryo + Matrix. I'll look it up on google. https://www.skyebiologics.com/cryomatirx/
(((Stupid website named the link wrong . . . for their product))) . . . I just contacted the company and told them that their link was wrong . . . hahaha
My in-game name in PoE is a play on my kid's name with an underscore and then something about the build. I do this so my guild knows its me. Most Pathetic In-game name:
In EVE, my combat guy had a pathetic name . . . "Chancellor Doom"