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Cognomen Iachan (Яшан , Iachan ) , in the entire world, is a rare surname. The cognomen Iachan is habitual in Ukraine, where it is quite a rare surname, Kyrgyzstan, where it is a rare surname, and Russia, where it is a very rare surname. Not in comparison with a country's population, the name is most common in Ukraine, Russia, and Brazil. Very seldom, Iachan is the forename as well as the last name.