Cognomen สิทธ์ (Sit 
, Ity 
, สิทธ์ 
) , around the globe, is a common last name. The cognomen สิทธ์ is habitual in Macao, where it is quite a common surname, Bermuda, and Hong Kong (explore the name in all countries). In absolute terms, it is commonest in India, Myanmar, and Hong Kong. Likewise, สิทธ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sit | Hong Kong, Myanmar, Taiwan, India, China |
| Ity | Myanmar, United States, India, Indonesia, China |
| สิทธ์ | Thailand |
ใจสงฆ์, บัวนาค, ทองเพชร, and สุวัฒน์ศรีสกุล