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Surname コイケ (コイケ , Koike ) , across the world, is quite a rare family name. The last name コイケ is habitual in Bermuda, where it is quite a common surname, Taiwan, where it is quite a rare surname, and Papua New Guinea. In absolute terms, it most frequently occurs in Japan, Brazil, and Taiwan. More prevalently, コイケ is the forename as well as the last name.