What is the royal family's surname?
The British royal family's house name is Windsor, adopted in 1917. Some descendants of Queen Elizabeth II and Prince Philip use the surname Mountbatten-Windsor when a surname is needed.
Before 1917, the royal house was called Saxe-Coburg and Gotha, from Prince Albert's German family. During World War I, anti-German feeling led King George V to change the name to Windsor, after Windsor Castle.
Members of the royal family usually do not need surnames. Those with the title His or Her Royal Highness are known by their first names and titles.
Mountbatten-Windsor
In 1960, Queen Elizabeth II declared that her descendants without royal titles would use the surname Mountbatten-Windsor, combining her family name with Prince Philip's adopted surname, Mountbatten.
Prince Harry's children use Mountbatten-Windsor as their surname. Prince William and Prince Harry used Wales as a surname during their military careers, taken from their father's title.
Royal surnames can change depending on titles. For example, Prince George was known as George Cambridge at school.
Windsor remains the name of the royal house under King Charles III.