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Last name Guei (Guei , Гей ) , all around the world, is quite a common cognomen. The cognomen Guei is characteristic of Ivory Coast, where it is quite a common surname, Ukraine, where it is quite a rare surname, and Benin, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Ivory Coast, Ukraine, and Russia. Much less frequently, Guei is the forename as well as the last name.