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Family name Iung (Йунг , Юнг , Iung ) , all around the world, is quite a rare last name. The last name Iung is characteristic of Kazakhstan, where it is quite a rare surname, France, and Taiwan, where it is a rare surname. Not in comparison with a country's population, the name is most common in Brazil, Russia, and France. Much less frequently, Iung is the forename as well as the last name.