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Cognomen Кулай (Kulai , Кулай , Kulaj ) , all over the world, is quite a common surname. The cognomen Кулай is habitual in Belarus, where it is quite a rare surname, Kyrgyzstan, and Albania. Measured by absolute frequency, it most frequently occurs in India, Ukraine, and Belarus. Likewise, Кулай is the forename as well as the last name.