Surname Gachai (Гачай 
, Gachai 
, กาชัย ) , worldwide, is a rare family name. The family name Gachai is characteristic of Thailand, where it is a rare surname, Kenya, and Georgia, where it is a very rare surname. In absolute terms, it most frequently occurs in Thailand, Kenya, and India. Much less frequently, Gachai is the forename as well as the last name.