Same reason you don't call yourself Hong Kong Phooey?

I am sure that Sammy & Richard were their Dads names as well so it was just used.

So, Stone and Lloyd had a hotmail account corrupt on them as well? wow, I knew they were ahead of their time, but I thought that was just on the field of play.

Middle names perhaps? My Grandad has always gone by his.

Nicknames I believe. I am called by a variation of my middle name. My first name is a name given to all males born on my father's side going back a few generations and all were/are called by their middle name. No son for me though!