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Last name Duin (Duna , Duin , Dunum ) , in the world, is a common family name. The last name Duin is characteristic of Netherlands, where it is quite a common surname, Romania, and Botswana, where it is quite a rare surname. Not in comparison with a country's population, this name is the most popular in Netherlands, Romania, and South Africa. Likewise, Duin is the forename as well as the last name.