Years ago, in like 8th grade, I was playing rainbow six and a friend got the name 'I want Shania Twain' or something along those lines.
I called myself 'so do I'
He dropped the name the next round but I kept it for a while. Then, when HL came out, I tried to make it 'So do I' but I forgot the quotes, and it came out So. I decided I liked it and stuck with it.
Later I changed it to 'So?' and that is what I go by in all my games, but unfortunately, AT doesn't allow '?' in the name, so I am back to 'So'