Pretty sure I had this trouble with either Divinity: Dragon Commander or Divinity: Original Sin as well, but Dungeons 2 seems set to keep my player name for multiplayer the same as my computer's name. I suspect this is because it would otherwise pull the player name from the player's Steam name/ID.

I'd like to manually change it, or at the very least, match it to my GOG.com username. Is there any way to change it without renaming my computer? Failing that, how do I set it to normal case instead of all caps?