I use this name for a lot of stuff online. It's never taken and it's unique. Long story short, "poker playing ogre"= Pogre. Poh-grr.
I highly doubt there's an option to change your name. Many forums don't even have the feature. Are you wanting to use the same email or something? You joined not long ago. You could just do another account. Maybe put something in your sig so folks know who you are for a couple weeks.