What is Prince William's last name?

Royal family fanatics, rejoice! The new royal princess has a name, and a very royal new title: Her Royal Highness Princess Charlotte Elizabeth Diana of Cambridge. But when she comes of age, how should she fill out her drivers license? read more

Now that Prince William and Kate Middleton are married, some are wondering their last name. Like other descendants of Queen Elizabeth II and Prince Philip, William's surname is Mountbatten-Windsor, and it will be Kate's too by marriage. read more

King George V, the Queen's father, chose Windsor as the royal surname in 1917, and the Queen's husband Prince Phillip's surname is Mountbatten. There ya go! In William's case, he has a title, so he can take the hyphenated last name or leave it, depending on the situation. read more

Therefore, Mountbatten-Windsor is the surname of all male (and unmarried female) descendants of Prince Philip and Queen Elizabeth II; this includes Prince Charles, Prince William and Prince Harry. Because Prince Harry and Price William use the title Prince, they do not use the last name Mountbatten-Windsor. read more