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Family name Ergen (二根 , Ерген , Ergen ) , all around the world, is a common cognomen. The cognomen Ergen is characteristic of Turkey, where it is quite a common surname, Belgium, where it is a rare surname, and North Macedonia. Measured by absolute frequency, it is the most numerous in Turkey, China, and Germany. Much less frequently, Ergen is the forename as well as the last name.