Surname Koulai (Кулай 
, Koulai 
, Кулаи ) , across the world, is quite a rare cognomen. The last name Koulai is habitual in Belarus, where it is quite a rare surname, Ivory Coast, and Kyrgyzstan. Not in comparison with a country's population, it is the most numerous in Ivory Coast, Ukraine, and Belarus. Likewise, Koulai is the forename as well as the last name.