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Last name Nortun (Nortun ) , around the globe, is a very rare surname. The last name Nortun is characteristic of Norway, where it is a rare surname, Thailand, where it is a very rare surname, and Germany, where it is an extremely rare surname. Measured by absolute frequency, the name is most common in Norway, Thailand, and India. Much less frequently, Nortun is the forename as well as the last name.