My first gaming name was GeoffatOU... ET was my first multiplayer internet game and I just needed anything to get past the setup the screen. I was attending OU at the time and that was the first thing that came to mind... I know, very imaginative. So naturally that progressed to TulsaGeoff when I moved back to Tulsa. Having a name that incorporated my located has actually resulted in meeting two of my best friends that I went to school with and also I met a mechanic that fixed one of my cars at a great price
In MMO games, I always go with the name DamageDealer. It's from one of my old gaming buddies that used to use the name DMGdealer as an alias in ET. I think its is just a bad ass name.
I've also aliased with Monster in the past since I love Monster energy drinks and it sounds like beast name.