So, just like the title says, why did you choose your user name?
For me, it all started in 2004. In college, I wanted to make a superhero version of myself and put it in a story. I had to come up with a name for myself that was fun and original. At that time I was playing Castlevania Symphony of the Night and thought Alucard was a cool character. Alucard is Dracula spelled backwards, so I just found a word representing good HOLY and spelled it backwards YLOH.
Today I think Yloh is pretty weird for a name, but I still use it as a user name because most people don't use it. People who know me, in the real world, will easily be able to identify me by seeing Yloh. It just kind of grew on me.