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Technically, their last name is Mountbatten-Windsor, although William and his brother use the surname Wales in their professional lives. However, as a Royal, if you have a title, you do not use a last name. They will be referred to as Prince William of Wales, Duke of Cambridge and Princess Catherine of Wales, Duchess of Cambridge. They also hold the titles Earl of Strathearn and Countess of Strathearn, and Baron Carrickfergus and Baroness Carrickfergus.

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14y ago

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