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Family name Seys (Seys , 塞斯 ) , in the entire world, is quite a rare surname. The surname Seys is habitual in Belgium, where it is quite a common surname, France, where it is quite a rare surname, and Canada, where it is a rare surname. Not in comparison with a country's population, the name is most common in Belgium, France, and the United States. Very seldom, Seys is the forename as well as the last name.