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Family name Cey (セイ , Cey , Сей ) , across the world, is quite a common surname. The cognomen Cey is habitual in Cabo Verde, where it is quite a common surname, Japan, where it is quite a rare surname, and Belarus. In absolute terms, it is commonest in Japan, the Democratic Republic of the Congo, and Belarus. Much less frequently, Cey is the forename as well as the last name.