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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.
Royal house. A royal house or royal dynasty is a family title, or family name of sorts. It is used by royalty. It usually means the members of a family in old and young people, who are loosely related. Unlike most western people, a great number of the world's royal families do not have family names, and those that have them do not use them often.