Always went with Bettadenu unfortunatly at times when I try to sign up for stuff someone else has taken it . I got this name because I once had a little arguement with a guy in a Halo server and he was a horrible typer even for a native English speaker, so for the purpose of poking and annoying him I changed my ingame name to Bettadenu (instead of: Better Than You) and beat him over and over till he left the server ahh good times
IRL, my friends call me Ivan, even though that is my middle name and not actually my nickname. In the virtual, I pretty much just use VagrantXeth, that was a suggested name from the first days of Xbox Live on the original Xbox, so I just kind of stuck with it and have used it as my name everywhere it is available. So far, it has never been taken, lol!
Most of my mates call me Max Power. It started when I worked in retail and I would answer the phone 'blah blah blah.....Matt speaking'. About 80% of people would call me Max by mistake. In a Simpsons episode, Homer changes his name to Max Power so my friends changed my name to that too. I even had my old car licence plate as MAXPOWR. Once I got pulled over by a cop for running a red light and she asked me if I got it from The Simpsons. I said yes and she let me off!