Want a custom last name for your Second Life character? Linden Labs will let you do it, but you'll have to pony up a recurring fee for the privilege - $100 up front and $50 a year. Linden's rationale:
For your money, they'll go the extra step to verify that you are really who you say you are. Or, perhaps more appropriately, if there's a guy named "John Edwards," it's really him.
Second Life To Charge For Names [Kotaku]