Kit, which is an American shortening of Chris, and that's what I was called at school. Whilst still at school I dabbled in rocketry and got the nickname of Jet. Neither name was long enough to be acceptable as a nom-de-plume and strangely Jetkit and Kitjet have been taken in so many on line situations so I crammed an underscore in to give me jet_kit.
Simple really, I don't know how you didn't guess it
