Family name Kaewthai (Kaewthai 
) , across the world, is a rare last name. The cognomen Kaewthai is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname.
Sasi, Klaewkla, Paphitsiya, Piyaphat, Piyamart, Phuwanai, Juthaporn, Thidarat, Teerawat, Tiamprad, Nachanan, Nachanok, Sittichai, Supawadee, Bussayamas, Pattranit, Rattanita, Thaveesak, Chamnong, Warinya, Nitirat, Thipnikorn, Jira, Sakorn, Sunisa, Somjit, Sophon, Kalaya, Pranee, Puthon, Kanlayanee, Lalisa, Wannee, Wichai, Supawee, Akkapon, Boonnum, Korlarp, Khamron, Rinrada, Jaroon, and Rattanaporn