Surname สิษฐ (Sit 
, สิษฐ 
) , in all the world, is a common cognomen. The cognomen สิษฐ is habitual in Macao, where it is quite a common surname, Bermuda, and Hong Kong (explore the name in all countries). Not in comparison with a country's population, it most frequently occurs in India, Myanmar, and Hong Kong. Also, สิษฐ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sit | China, Myanmar, India, Hong Kong, Taiwan |
| สิษฐ | Thailand |