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Surname Kelen (Kelen , 凱倫 , Келен ) , in all the world, is quite a rare last name. The cognomen Kelen is characteristic of Marshall Islands, where it is quite a common surname, Belgium, where it is quite a rare surname, and Hungary. Not in comparison with a country's population, the name is most common in Indonesia, Turkey, and Belgium. More frequently, Kelen is the forename as well as the last name.