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Cognomen Kalbai (Калбай
, Kalbai
, Калбаи
) , in the entire world, is a rare last name. The cognomen Kalbai is characteristic of Kyrgyzstan, where it is quite a rare surname, Russia, where it is a very rare surname, and Kazakhstan. Not in comparison with a country's population, it is the most numerous in Kyrgyzstan, India, and Russia. More prevalently, Kalbai is the forename as well as the last name.