While we wait, can anyone explain the whole last name thing?? How does it work for the royals?
I'll give it a try...
The British royal family uses Windsor as a last name.
In 1917 King George V changed the family house from the German House of Saxe-Coburg and Gotha to the House of Windsor.
Elizabeth II full name is Elizabeth Alexandra Mary Windsor
BUT
If needed, royals who are descended from Elizabeth II in the male line use Mountabtten-Windsor as a last name by those who are not styled HRH and title of Prince or Princess
I guess having HRH and Prince or Princess allows them to use their titles as last names?
HRH Prince William of Wales, William Wales in the military but now goes by HRH Prince William, Duke of Cambridge and his family uses the title Cambridge. I do wonder when William becomes Prince of Wales do his children also become Wales's? Prince George of Wales etc..
HRH Prince Henry of Wales, Henry Wales in the military but now goes by HRH Prince Henry, Duke of Sussex and this family uses the title Sussex
HRH Princess Beatrice of York
HRH Princess Eugenie of York
Now Prince Edwards kids...Lady Louise, Alice, Elizabeth, Mary Mountbatten-Windsor
James, Viscount Severn. James, Alexander, Philip, Theo Mountbatten-Windsor