Surname Supphachai (ศุภชัย 
, Supphachai 
) , all over the world, is a very rare cognomen. The last name Supphachai is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Much more frequently, Supphachai is the forename as well as the last name.
Saham, Thongren, Yutitham, Sakhonsungnoen, Chomchoei, Kaewkosaba, Kaeokaemchan, Pholthawee, Plotchaikwang, Tangkitpitakpol, Thammajan, Thongluan, Thongaram, Chitngamphong, Pattanadisai, Phuttharak, Phromchuai, Rattanchan, Likhitkhajorn, Thongduang, Surapongpracha, Rattanachan, Thepluean, Tangyarit, Duangaiad, Rodthong, Supan, Ainsuk, Chobjit, Bosaard, Bunrot, Kunnok, Phlahan, Phlunang, Olakit, Somkaeo, Warapornmongkolkul, Aimpheng, Chunora, Kongyoi, Khaochuea, Pongsao, Sapantong, Simueang, Songsang, Sornphrom, Chokphornprasert, Bunsamoe, Choniad, and Visutthikullaphan