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Surname Hirn (Hirn , 希恩 , Гирн ) , in the world, is quite a rare last name. The family name Hirn is habitual in Finland, where it is quite a rare surname, Austria, and Germany. Not in comparison with a country's population, it is the most numerous in Germany, the United States, and France. Also, Hirn is the forename as well as the last name.