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Family name Nordby (Нурбю , Nordby , Нордбю ) , throughout the world, is quite a rare last name. The cognomen Nordby is habitual in Northern Europe, particularly Norway, where it is quite a common surname, Denmark, where it is quite a rare surname, and Sweden. Measured by absolute frequency, it most frequently occurs in Norway, the United States, and Denmark. Much less frequently, Nordby is the forename as well as the last name.