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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.
Queen Elizabeth's last name...QUEEN ELIZABETH I's last name was Tudor. She was daughter of King Henry VIII and Anne Boleyn. She was born on Sunday September 7th, 1533. She died on March 24, 1603. QUEEN ELIZABETH II, England's current monarch's last name is Windsor, though the original family name was Saxe-Coburg-Gotha.