Throughout the world, Manchai (มานะชัย 
, Manchai 
, มั่นใจ) is quite a rare principally male, but very seldom feminine forename. The first name Manchai is characteristic of Thailand, where it is quite a rare primarily masculine, but very seldom female name, Nigeria, where it is a very rare epicene name, and India, where it is an extremely rare unisex name. Much less frequently, Manchai is the last name as well as the forename.