Cognomen Thanvalai (Thanvalai 
) , in the world, is an extremely rare surname. Much more prevalently, Thanvalai is the forename as well as the last name.
Ketput, Dejkla, Jinaket, Doungdee, Thongkum, Kaveerath, Taveesinwattanasakul, Ngernyouang, Vorapojphaisan, Samneangyen, Leardratthaphong, Taechamanee, Chinupakanpong, and Rungrueangaree