Surname Siriwichai (สิริวิชัย 
, Siriwichai 
) , throughout the world, is a rare last name. The last name Siriwichai is habitual in Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname. Much less frequently, Siriwichai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| สิริวิชัย | Thailand |
| Siriwichai | Thailand, United States |