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Surname Rosher (Rosher , Рошер , רושר ) , in the entire world, is a rare last name. The last name Rosher is habitual in the United Kingdom, where it is a rare surname, Australia, and Canada, where it is a very rare surname. Not in comparison with a country's population, the name is most common in the United Kingdom, the United States, and Australia. Much less frequently, Rosher is the forename as well as the last name.