Cognomen Wijai (วิจัย 
, Wijai 
) , globally, is a very rare last name. The last name Wijai is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much more prevalently, Wijai is the forename as well as the last name.
Jose, Khankaew, Khongkha, Thaewtab, Tongnoon, Foorungseeroij, Sansuwanna, Sakoolkaew, Khamthipha, Thanawong, Theravuthi, Thongjinda, Thongwilai, Wannapakdee, Wongsanam, Atiwattanateerakul, Kitwattanachai, Narongthip, Ketsuwan, Watcharasom, Suankool, Muangjai, Koson, Kosom, Kumar, Sapmak, Kodech, Thaikla, Sukhrom, Ayurayuenyong, Karnwilai, Phonyuean, Phenanon, Tumtong, Nankani, Niamkerd, Norasan, Wiruschava, Meksuriyen, Sukarome, and Boonyanusith