I actually chose Nanashi when I was just getting into Japanese culture, as it literally translates to "No Name." I thought it was kinda funny, seeing as how if your name is Nanashi, even if it means no name, you do have one.
After a while I decided I didn't want to give the impression that I was ACTUALLY Japanese, so I developed the name Aurel Tristen, with Aurel being short for AURELIUS. Tristen (Often popular in the US as a first name) is a modified spelling of TRISTAN, witch seems to have several interesting meanings in different cultures.
I put a LOT of thought into names, especially in my book, or in other stories, and its actually really interesting to read this thread, as many times I've looked at odd names and wondered how the hell they came about.
I don't know why anyone would EVER volanterally use a number in a name though, like Sniperwolf4562 (Sniperwolf being one of the most popular online gamer tags of all time BTW). Be more creative! Number scream NOOB, and UNCREATIVE! ^_^