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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.
Prince William's official last name is: Mountbatten-Windsor. That is quite a mouthful. The name comes from the merging of names of the Queen and Prince Phillip in 1960. Her last name was Windsor, and his was Mountbatten. Internet searches for What is Prince William's last name are up 1199 percent this week.