When I joined Pinside in March 2012, my name was NewPinOwner. I think around the 10 pin mark (buying and selling), I realized this was a long-haul thing, and I was able to change it to just NPO. If you search "NewPinOwner", it will come up in some people's posts when referencing me.
Plus, it's easier for people to say when meeting up at shows ; ).