Family name ศิริวงศ์อุทัย (ศิริวงศ์อุทัย 
) , throughout the world, is a very rare last name. The cognomen ศิริวงศ์อุทัย is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| ศิริวงศ์อุทัย | Thailand |