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Family name Kumai (Kumai , Kuamai , Кумаи) , in the world, is quite a common last name. The cognomen Kumai is characteristic of Qatar, where it is quite a rare surname, Nepal, and Kuwait, where it is a rare surname. Not in comparison with a country's population, it most frequently occurs in India, Nigeria, and Nepal. Much less frequently, Kumai is the forename as well as the last name.