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Cognomen Ihn (Ihn ) , all over the world, is quite a rare last name. The cognomen Ihn is habitual in South Korea, where it is quite a rare surname, Taiwan, where it is a rare surname, and Germany, where it is a very rare surname. Measured by absolute frequency, it is commonest in South Korea, Taiwan, and the United States. Very seldom, Ihn is the forename as well as the last name.