I don't have a real name
You do have a birth cert.
It is kinda funny though, the preference for names. On FB, my re-Gaelicized name is apparently popular despite the difficulty for Anglophones to spell it. On Star Trek Online, I prefer to be called my Federation character's name- one of my fleetmates asked me yesterday what my actual name was since we were going between FB, STO, and gmail (gmail has my legal name), but she's going to continue referring to me by my Andorian name. In person, I prefer to be referred to by my legal name.
Unless you're Dimo, who insists on calling you the name he was introduced to you as, so he will always call me Twid, never Kev.
I'm the same way. I can't keep track of people otherwise. There are so many Johns and Steves and Anthonys. There were six Johns in my store. Five Anthonys. Three Steves. Two Jacobs. Two Jasons. Eighteen Jennifers. Crazy.
If you prefer to call me Twid, I know that I am Twid.
If you prefer to call me Kevin, well, how many Kevins are here?
Actually you're another. You're just always going to be CPD regardless.
Is there is but one Twid and Twid is Twid's prophet.