what is prince harrys last name

Prince Harrys full name is Henry Charles Albert David, Duke of Sussex, Earl of Dumbarton, Baron Kilkeel. Although he is known to everyone as Harry, he doesnt technically have a surname as traditionally, anyone in the Royal Family who has a Prince/Princess, or a His/Her Royal Highness title, doesn’t officially have one. However, his son Archie used to use Mountbatten-Windsor prior to officially becoming a prince in March 2023.