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Family name Coghen (Coghen , كوجين ) , around the world, is a very rare surname. The cognomen Coghen is characteristic of Poland, where it is a rare surname, Spain, where it is a very rare surname, and the United Kingdom, where it is an extremely rare surname. In absolute terms, it is commonest in Poland, the United States, and Spain. Also, Coghen is the forename as well as the last name.