Cognomen Tirachai (Tirachai 
) , in the world, is a very rare surname. The cognomen Tirachai is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. More frequently, Tirachai is the forename as well as the last name.
Aweahama, Kambhu, Tongon, Siriwan, Awaehama, Tong-On, Yotkaeo, Yenchai, Pornsalnuwat, Pipitsupaphol, Na Lampuhn, Thongmong, Tejapanicharoen, and Chomphunop