Family name Chumai (Chumai 
) , across the world, is a rare surname. The surname Chumai is characteristic of Thailand, where it is a rare surname, South Africa, where it is an extremely rare surname, and the United Kingdom. Not in comparison with a country's population, it is the most numerous in Thailand, Nigeria, and South Africa. Likewise, Chumai is the forename as well as the last name.