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Cognomen Dougan (دوغان , Dougan , 杜根 ) , all around the world, is quite a common family name. The cognomen Dougan is habitual in Saint Vincent and the Grenadines, where it is quite a common surname, Equatorial Guinea, and Ireland, where it is quite a rare surname. In absolute terms, this name is the most popular in the United States, the United Kingdom, and Ghana. Much less frequently, Dougan is the forename as well as the last name.