Cognomen Kwanhathai (Kwanhathai 
) , in the world, is an extremely rare family name. The cognomen Kwanhathai is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Much more prevalently, Kwanhathai is the forename as well as the last name.
Liang, Thairach, Tongboon, Fungfeung, Mongchoel, Sakulmeekiat, Sithikornkul, Suksamana, Ariyawong, Petchkaew, Rangponsamrit, Jitmanowan, Thongplew, Hongpanut, Viratikun, Mongkolsee, Pathomnupong, Rungtivaruangrong, Likhitweerawong, Tangjitpornchai, Tongleepan, Chaimongkol, Lamangthong, Puentong, Pahonkarn, Padermsilp, Inpia, Sintao, Sudrat, Asaman, Kaewsa, Jaikla, Jitpttak, Thepkwan, Wutthi, Saikeaw, Rattanaphun, Sriwatjana, Kunkeaw, Permnam, Pimhirun, Dejkong, Taibowonpitak, Tueksakul, Wongrak, Sinthopachakul, Settarin, Kwansamran, Cholsuk, and Thongpradit