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Surname Carn (Carn , カーン , 卡恩 ) , in the entire world, is quite a rare family name. The surname Carn is characteristic of Australia, where it is a rare surname, France, and the United Kingdom. Measured by absolute frequency, the name is most common in the United States, France, and the United Kingdom. Likewise, Carn is the forename as well as the last name.