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Family name Pruun (Brun , Pruun , Brûn ) , throughout the world, is a common last name. The last name Pruun is characteristic of Guernsey, where it is a common surname, France, where it is quite a common surname, and Reunion (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in France, Switzerland, and Argentina. Very seldom, Pruun is the forename as well as the last name.