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Family name Cú (Cú , Ку ) , all around the world, is a rare last name. The surname Cú is habitual in Guatemala, where it is quite a rare surname, Kazakhstan, where it is a rare surname, and Russia, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Guatemala, Russia, and Vietnam. Very seldom, Cú is the forename as well as the last name.