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Family name Raun (Raun , Round , Reynir ) , around the world, is quite a common last name. The last name Raun is habitual in Northern Europe, particularly Estonia, where it is quite a common surname, Denmark, and the United Kingdom, where it is quite a rare surname. Measured by absolute frequency, it most frequently occurs in the United Kingdom, the United States, and Denmark. Much less frequently, Raun is the forename as well as the last name.