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In the entire world, Koyo (Koyo , Коё) is quite a common principally girly, but very seldom male forename. The first name Koyo is habitual in Japan, where it is quite a rare female name, Morocco, where it is a rare masculine name, and Tanzania. Measured by absolute frequency, it is the most numerous in Japan, India, and Indonesia. Likewise, Koyo is the last name as well as the forename.