Surname Wiroj (Wiroj 
) , in the world, is a very rare family name. The surname Wiroj is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname, and Malaysia, where it is an extremely rare surname. Much more frequently, Wiroj is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Wiroj | Thailand, United States, India, Malaysia, China |
Malai, Bunyasantisuk, Khamhaeng, Jumpathong, Tansrisuroj, Taweepworadej, Thongkong, Wannapira, Wanitpatpong, Samattasribut, Kongkasawat, Pattaradul, Juangsantad, Tanglamlert, Ingkapattanakul, Panasantipong, Preechapakdee, Techamahaphan, Triratanaphan, Wacharajarunun, Sirichaicharoen, Tangparimonthon, Chutinara, Tirasakul, Prabphan, Sengsook, Karoh, Saipan, Saelee, Sukket, Jainam, Jehtae, Jumpee, Talung, Yommuang, Uaisin, Wongthongluea, Mohchan, Srirach, Chayvichit, Ketkaew, Klaydoung, Jultong, Tankaew, Tothaisong, Imsaard, Sangpoum, Senasakul, Saewong, and Siriwatcharapiboon