User blog comment:Bullet Francisco/The Origin of Your Username/@comment-4008402-20130705011727

In homage to a certain videogame weapon from a now deceased MMO.

Ironically, I found a much better weapon that was never released that I'd rather change my name to (but I already used up my free name change to change from Rex209 (which I did based off the exact name of an exo-suit from a videogame), because everyone thought rex was my real name or liked dinos or rex from Clone Wars).