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Cognomen Asen (Asen , Асен , 阿森 ) , throughout the world, is a common last name. The family name Asen is habitual in Bulgaria, where it is a common surname, North Macedonia, where it is quite a rare surname, and Fiji. Measured by absolute frequency, it most frequently occurs in Bulgaria, Ethiopia, and Nigeria. More prevalently, Asen is the forename as well as the last name.