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Surname Karn (Karn , กานต์ , カーン ) , in all the world, is a common cognomen. The cognomen Karn is habitual in Nepal, where it is quite a common surname, Qatar, where it is quite a rare surname, and Liberia. Not in comparison with a country's population, the name is most common in India, Nepal, and the United States. Also, Karn is the forename as well as the last name.