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Cognomen Ouen (Ouen , Уен , Оуэн ) , in all the world, is a rare surname. The last name Ouen is habitual in Bulgaria, where it is quite a rare surname, Tunisia, where it is a rare surname, and Algeria. In absolute terms, it is commonest in Algeria, Tunisia, and France. Very seldom, Ouen is the forename as well as the last name.