Fans of the Royal Family will know that its members carry all sorts of prestigious titles, but the Queen's relatives who are further down the line of succession don't have this privilege, which means they have to use normal surnames. So while Prince George, Princess Charlotte and Prince Louis use their parents' 'Cambridge' title as their surname at school, their cousins Archie and Lilibet use the royal family's 'official' last name - Mountbatten-Windsor.
But the name was the subject of controversy many years ago and even led to a rift between the Queen and her husband, the Mirror reported. The name combines the royal family name, Windsor, with Prince Philip's surname, Mountbatten.
It didn't appear on an official document until 1973, but the story behind it dates all the way back to 1952. Before marrying The Queen and becoming the Duke of Edinburgh, Philip's official title was Prince Philip of Greece and Denmark of the House of Schleswig-Holstein-Sonderburg-Glücksburg.
