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Cognomen Герн (Gern , Guerne , Guern ) , around the world, is quite a rare last name. The surname Герн is characteristic of Western Europe, particularly Switzerland, where it is quite a rare surname, France, and Germany, where it is a rare surname. In absolute terms, the name is most common in France, Germany, and the United States. Very seldom, Герн is the forename as well as the last name.