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Family name Koa (柯 , Koa , コア ) , throughout the world, is a widespread surname. The surname Koa is habitual in China, where it is quite a common surname, Cameroon, where it is quite a rare surname, and Botswana. Measured by absolute frequency, it is the most numerous in China, Cameroon, and the Democratic Republic of the Congo. Much less frequently, Koa is the forename as well as the last name.