Last name Lachai (Lachai 
, ลาชัย ) , around the globe, is a rare cognomen. The family name Lachai is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname, Myanmar, and Malaysia, where it is an extremely rare surname. Measured by absolute frequency, it is the most numerous in Thailand, Myanmar, and India. Likewise, Lachai is the forename as well as the last name.