Well for mine I just put my first name and my favorite number. Xavier+9=xavier9. That didnt really roll of the tounge so I added "the" in between, hence, Xavierthe9.
I wanted to put like a paradox or something, so I used 'invalid'. I originally wanted to put only one '7' at the end, but then I found out it was already used. So, I put three 7's.
ummmm... let me think, OH! OH!! I got it... okay, I got my name from, well, I originally wanted chaseroflight, but It wouldnt work (I think it was already taken :P) so I got the next best thing...
I have no idea. Honestly, I used to go by Shotz or TheReaper depending on what the game site/game was. Now I go by Shotz occasionally, devmazter, but mostly devsaupa. The origin is not known by me. I think I first used it. All I know is that DEV are the first three letters of my name, and shotze is the alt I have on my PS3, yes with an e.
Well I like the Mortal Kombat series(Sub Zero being my favorite, of course) and I love James Bond in a no homo sort of way. So yea. Sub Zero+007=my username.
Just a regular pseudonym I use for gaming. Things just snowballed from there and I started using it for whenever I needed a nickname or something for online