Techincally it's not a last name, it's the dynasty. Winsor isn't Queen Elizabeth last name, it's the dynasty she belongs to. Technically they don't have surname. I remember some Scandinavian prince who wanted to do a MA in the US had some burocratic issues because of that.
Things fall apart; the centre cannot hold; Mere anarchy is loosed upon the world, The blood-dimmed tide is loosed, and everywhere The ceremony of innocence is drowned; The best lack all conviction, while the worst Are full of passionate intensity. Yeats