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All around the world, Cú (Cú , Ку ) is a very rare epicene first name. The forename Cú is habitual in Kazakhstan, where it is a very rare epicene name, Vietnam, and Russia, where it is an extremely rare largely boy's, but uncommonly female name. More frequently, Cú is the last name as well as the forename.
Cú is also a name for the fictitious and mythical characters: Cú Chulainn , the fictional character from the Fate franchise, Fate/stay night.