Surname Viwatchai (Viwatchai 
) , in the world, is a very rare cognomen. The cognomen Viwatchai is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. More prevalently, Viwatchai is the forename as well as the last name.
Korn, Chairat, Tonlarpcharoen, Satjariyakul, Chatnutthaset, Puakphothong, Kronchantes, Chatnatthaset, and Khumprapai