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Family name Poza (Poza , Pose , Esposa ) , all around the world, is a common cognomen. The family name Poza is habitual in Uruguay, where it is quite a common surname, Argentina, where it is quite a rare surname, and Spain. Measured by absolute frequency, it is the most numerous in Germany, Argentina, and Spain. Much less frequently, Poza is the forename as well as the last name.