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Family name Sey (Sey , เส่ย, เส้ย) , around the globe, is a common surname. The cognomen Sey is habitual in Sub-Saharan Africa, particularly Gambia, where it is a common surname, Ghana, where it is quite a common surname, and Ivory Coast, where it is quite a rare surname. Much less frequently, Sey is the forename as well as the last name.