In the mid-2000s I played a game called Runescape, a game that was mostly played by teenagers with names like "Ipwnj00noob", "Psykogodkilla", "l33t badaz", "Ipwnurmom", etc. I figured with a name like Joe Schmoe there's no way I'd be mistaken for a 12 year old, and the name stuck for all these years.