My original name on painting forums was 'flynn', which was part of a name I made up for myself quite some time ago--Flynn McKerrow. Flynn was just a name I liked, and McKerrow was a small town in western Ontario that I saw on a map, and liked the sound of it. I'm still flynnmckerrow in a few different places (including ebay).
Last year I decided to drop the 'flynn' moniker, and just stick with my initials, since it's what I sign just about any correspondence with anyway. Amusingly, people seem to think my name is 'Pae', and wonder how to pronounce it. I should just tell them that "it sounds just like Philip".