Quote Originally Posted by Heming View Post
Isn't it more likely that he becomes King Charles III?
They do not have to choose the name they have been known by up to that point but may choose another of their names. He has a choice of Charles, Philip, Arthur and George. Philip and Arthur are fairly unlikely.

For example George VI had been known as Prince Albert, Edward VIII as David, Edward VII as Albert Edward, Victoria was that Queen's second name, the first being Alexandrina.