Along with the likes of Beyoncé and Madonna, The Royal Family doesn't really use their last name — meaning most of us probably don't have a clue as to what it is. This is probably why The Independent did some digging on the Royals' official website to report that up until the early 20th century, they actually had no last name at all, but were instead known by the names of the county of which they ruled. The website states: "The names of dynasties tended to change when the line of succession was taken by a rival faction within the family (for example, Henry IV and the Lancastrians, Edward IV and the Yorkists, Henry VII and the Tudors), or when succession passed to a different family branch through females (for example, Henry II and the Angevins, James I and the Stuarts, George I and the Hanoverians)." It was only when King George V came into power in 1917 that it all changed, when he decided that his family and all of his descendants would instead have the surname Windsor. In 1960, though, the Queen and the Duke of Edinburgh wanted to create their own surname that differed from the rest of the Royal Family, so decided on the name Mountbatten-Windsor. The official site adds: "The effect of the declaration was that all The Queen's children, on occasions when they needed a surname, would have the surname Mountbatten-Windsor.""Unless The Prince of Wales chooses to alter the present decisions when he becomes king, he will continue to be of the House of Windsor and his grandchildren will use the surname Mountbatten-Windsor." Well now you know!