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Cognomen Koge (Koken , Koge , 高下 ) , all over the world, is a widespread surname. The surname Koge is characteristic of Japan, where it is a common surname, Cameroon, where it is quite a rare surname, and Ghana, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Japan, India, and Cameroon. Very seldom, Koge is the forename as well as the last name.