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Last name Kohei (Kohei , コウヘイ , كوهي , among others...) , across the world, is a widespread cognomen. The last name Kohei is habitual in Japan, where it is quite a common surname, Iran, and Singapore, where it is a rare surname. Measured by absolute frequency, it is commonest in Japan, Iran, and China. Much less frequently, Kohei is the forename as well as the last name.