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Throughout the world, コイ (Khoi , Coy , Koy ) is a common primarily male, but scarcely girly given name. The first name コイ is characteristic of Vietnam, where it is quite a rare primarily masculine, but very seldom female name, the United States, where it is quite a rare male name, and Jamaica, where it is a rare boy's name. Measured by absolute frequency, it most frequently occurs in the United States, Vietnam, and Indonesia. More frequently, コイ is the last name as well as the forename.
コイ is also a name for the fictitious and mythical characters: Coy Duke , character in The Dukes of Hazzard.