Mountbatten-Windsor would be the surname of her and her husband's male-line descendants

On 8 February 1960, several years after the death of Queen Mary and the resignation of Churchill as prime minister, the Queen issued an Order in Council declaring that Mountbatten-Windsor would be the surname of her and her husband's male-line descendants who are not styled as Royal Highness or titled as prince or princess. While it seems the Queen had "absolutely set her heart" on such a change and had it in mind for some time, it occurred only 11 days before the birth of Prince Andrew (19 February), and only after three months of protracted correspondence between constitutional expert Edward Iwi (who averred that, without such a change, the royal child would be born with "the Badge of Bastardy") and Prime Minister Harold Macmillan who had attempted to rebuff Iwi.