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Cognomen Kayb (Kayb , Каиб , Кайб ) , worldwide, is a rare surname. The cognomen Kayb is habitual in Kazakhstan, where it is a rare surname, Kyrgyzstan, and Belarus, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in Kazakhstan, Russia, and India. Also, Kayb is the forename as well as the last name.