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Surname Когаи (Kogai , Kogay , Когаи ) , in the world, is a rare last name. The last name Когаи is habitual in Uzbekistan, where it is quite a rare surname, Kazakhstan, where it is a rare surname, and Kenya. Measured by absolute frequency, this name is the most popular in Uzbekistan, Russia, and Kenya. Very seldom, Когаи is the forename as well as the last name.