Cognomen สมทิตย์ (สมทิตย์ 
) , around the globe, is an extremely rare surname. The family name สมทิตย์ is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Much more frequently, สมทิตย์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| สมทิตย์ | Thailand |