Shortly after I made a Steam account, the "Epic Beard Man" meme started coming out. I've always been a big fan of bears (the animals, not the hairy gay guys. Seriously, I'm always asked that. xD), I decided to change my Steam name to "Epic Bear Man" as a sort of parody of Epic Beard Man. The name ended up sticking, I haven't really changed it (I have a couple of times, but to other joke names).
I also typically use the usernames Letanas or Volundarkvioa for accounts I make. Letanas is an anagram of Satan'el I made, and is the name of a devil-like character I made up years ago for a story I tried writing.
Volundarkvioa is a Romanized version of a Norse tale (although it'd be closer to Volundarkvida in English, but I preferred just writing it as Volundarkvioa), which basically is about a drunk blacksmith, and Valkyries and other crazy shit. If you wish to read it, here's the link:
http://www.sacred-texts.com/neu/poe/poe17.htm