The royal baby‘s surname is unclear at this point, but it could be Mountbatten-Windsor.
Prince William and Duchess Catherine typically don’t use the surname, because of the titles before their first names.
George V in 1917 declared that Windsor be the surname for all descendants in the male line of Queen Victoria, other than female descendants that who marry, shall bear the name of Windsor, according to the United Kingdom government.
But in 1960 the Queen and the Duke of Edinburgh decided that they wanted their own direct descendants to be distinguished from the rest of the royal family, so another declaration was made: all descendants of the Queen, other than those with the title of Prince or Princess, or females who married, would carry the name Mountbatten-Windsor.
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Members of the Royal Family often don’t need a surname, noted the government, but when they do, such as in marriage, it is available for use.
Whatever last name he receives, it won’t be used much. “The baby will be known as His Royal Highness Prince George of Cambridge,” according to the Clarence House.