When I originally set up my Xbox Live account, I couldn't get my first choice gamertag. Someone had already claimed "aniki" as their own at some point during the original Xbox's lifespan, but as far as I can tell they've not used it on the newer machine. I could have added a string of numbers, and in fact ended up with "aniki2121", but that seemed kind of pointless - and I've never liked online names that stray from the alphabet.
So I took a line from a Yoko Kanno song, The End of All You'll Know, and used that instead.
In the last few days, Microsoft have announced that they're starting to free up unused tags. I've considered, briefly, trying to claim my original choice, but I've grown kind of attached to demondownload (I've been using it as the title for every blog I've had for years) and I think it's got a better ring to it than "aniki", as far as online handles go.
That, and I don't want to spend 800 points on the name change.