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Last name Rusen (Rus , 如森 , 汝森 ) , in all the world, is a common cognomen. The cognomen Rusen is habitual in Romania, where it is a common surname, Slovenia, where it is quite a common surname, and Reunion. Measured by absolute frequency, it is commonest in Romania, Indonesia, and Spain. Also, Rusen is the forename as well as the last name.