In contrast to their father, Archie and Lilibet's birth certificates listed Mountbatten-Windsor as their last names, as they didn't have the titles of prince and princess at the time of their births.

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Meanwhile, their children — Prince Archie, 5, and Princess Lilibet, 3 — originally went by the Mountbatten-Windsor family name. According to the royal family’s website, Elizabeth and Phillip ...