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The British Royal Family changed their last name from Saxe-Coburg-Gotha to Windsor in 1917. So Her Majesty's last name is Windsor. Windsor. Some of her family are entitled to use the name Mountbatten Windsor which was authorised by an order in council in 1960.
The current royal family is the Windsors, headed by Queen Elizabeth II and her husband, Prince Philip. Their four children, Charles, Prince of Wales; Princess Anne; Prince Andrew, Duke of York; and Prince Edward, Earl of Essex, form the next level of the royal family, followed by their descendants.