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Cognomen Гагов (Gagov , Gagow , Гагов ) , across the world, is a rare last name. The family name Гагов is habitual in Bulgaria, where it is quite a common surname, Hungary, where it is a rare surname, and Spain, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in Bulgaria, Spain, and the United States. Much less frequently, Гагов is the forename as well as the last name.