Cognomen Pornjai (Pornjai 
) , in the world, is an extremely rare family name. Much more prevalently, Pornjai is the forename as well as the last name.
Hays, Leetongin, Duangkliang, Imamnoeylaph, Hotrawaisaya, Khongdee, Katthahwin, Bualuang, Chatbanyong, Sujitham, Sutjitham, Siribrahmanakul, Rangson, Kaewman, Chinumnuaysook, Somboon, Sarnyos, Chatba, Romes, Smith, Taychameekiatch, and Srisuwantanu