What Is Prince George's Last Name
Prince George's official last name is Mountbatten-Windsor. This combined surname reflects the union of the House of Windsor and the House of Mountbatten. The name is used by some members of the royal family who do not hold a royal title.
Why the Royal Family Uses Different Surnames
Many senior royals are known only by their first names and titles, so a surname is rarely needed. When a surname is required, members of the royal family can use Mountbatten-Windsor. In some cases, they may also use the territorial surname of their parent's title.
How the Name Mountbatten-Windsor Came About
The name Mountbatten-Windsor was adopted after Queen Elizabeth II married Prince Philip, who was a member of the Mountbatten family. The House of Windsor was already the official royal surname. The combination created a single surname for descendants who do not hold the style of Royal Highness.
For more details on royal naming conventions, see the official royal family information page at https://www.royal.uk.
