Back in Mexico, sometimes you go by your last name, or your nickname in high school. Being Guevara my last name, people there tend to add a leading "EL" ( or a "la", the female equivalent) to your (last)name when referring to you, so I was "El Guevara". Does not make much sense on this side of the border but up to this day, when I go back there I am still addressed like that.
"Matador", the nickname, didn't feel like a good handle name for forums.