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Surname Posse (Posse , Поссе , Pouver ) , across the world, is quite a common last name. The last name Posse is habitual in Uruguay, where it is quite a common surname, Argentina, where it is quite a rare surname, and Sweden. Measured by absolute frequency, it is commonest in Latin America and the Caribbean, particularly Argentina, Colombia, and Uruguay. Very seldom, Posse is the forename as well as the last name.