Family name Sittisint (Sittisint 
) , worldwide, is a very rare surname. The cognomen Sittisint is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Sittisint | Thailand |
สิทธิสินธ์, and สิทธิ์สินธ์