Cognomen Кумаи (Kumai 
, Кумаи) , in the entire world, is quite a common last name. The cognomen Кумаи is characteristic of Qatar, where it is quite a rare surname, Nepal, and Kuwait, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in India, Nigeria, and Nepal. Very seldom, Кумаи is the forename as well as the last name.