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Family name Gagen (Gagen , เก็น , Гаген ) , all over the world, is quite a rare cognomen. The cognomen Gagen is habitual in Estonia, where it is quite a rare surname, Azerbaijan, and Australia, where it is a rare surname. In absolute terms, the name is most common in the United States, the United Kingdom, and Russia. Also, Gagen is the forename as well as the last name.