The names I use usually reflect myself in some form or fashion. My nickname for the forums is a take on my real name. Dana.
Some I've used are: Manfromdenmark, Danemarkian, Danish, The Dane.
Names in game, I usually try and give a name that's suitable and original to the character I'm trying to create. In the case of the names I have on the emu, I have Carta who is based on a hockey player I created in NHL 11, Revin is a take on Evin from the old EA live days, and Daen is taken from my name.