Cognomen Manatchai (Manatchai 
) , all around the world, is an extremely rare last name. The family name Manatchai is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Much more prevalently, Manatchai is the forename as well as the last name.
Wong, Inthuean, Muadmuang, Soomsank, Chananto, Bunthawi, Khongying, Phrommin, Puangsri, Nigornsaen, Jaikonkaew, Netmattana, Suwichannorakit, Roongrueng, Rungpeang, Sirisakpibul, Kaewkongma, Pathamaporn, Khajornklin, Jearanai, Rattanaburi, Niamhom, Laemphuta, Simma, Jiawkok, Thatu, Noree, Inwat, Ondee, Sakadklang, Petmuang, Jongjit, Fupinvong, Senphab, Kaihong, Pawutinan, Prommin, Promken, Phothon, Romwapee, Gramgormchit, Sangnak, and Thammachote