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Family name Ousen (Усен , Ousen ) , throughout the world, is a rare last name. The cognomen Ousen is characteristic of Kyrgyzstan, where it is quite a common surname, Kazakhstan, where it is a rare surname, and Denmark. Measured by absolute frequency, the name is most common in Kyrgyzstan, Kazakhstan, and Russia. More prevalently, Ousen is the forename as well as the last name.