Prince Harry “reassured” Queen Elizabeth II that dropping his royal surname, Mountbatten-Windsor, wasn’t a “personal dig” at her or the British royal family. But what was Queen Elizabeth’s reaction to Prince Harry dropping his royal surname? A source told Us Weekly on Wednesday, April 15, that the former Duke of Sussex is “not planning to drop his Mountbatten-Windsor title legally,” but simply wants to reserve the use of his surname for more formal occasions.