It's really up to you on this one, if you don't think you can take RP seriously with the name you might consider a new character or going through the process of the name change loophole people mentioned before, but if you don't mind your name you can always just play it off as the name is a result of circumstance like you never knew your family so you created your own persona at a young age or something completely out there that caused you to take on a potentially fake name. Most people won't mind your name bein' the way it is though.