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Family name Duyn (דין , Duyn , 杜因) , across the world, is quite a rare last name. The last name Duyn is habitual in Netherlands, where it is quite a rare surname, New Zealand, and Israel, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Netherlands, the United States, and Israel. Much less frequently, Duyn is the forename as well as the last name.