My son's RL nickname is CF:
His name is Christopher and was on a baseball tournament team that consisted of 3 Christopher's, 3 Alex's, and 2 Zack's. Needless to say they needed nicknames. So my son got CF which were his initials, but also turned out to be the position he played. Center Field.
Strangely when I played Base Ball I played Right Field and my initials are RF.
Sadly when my son gets a boy he will have to name him Leonardo.