Family name สิเนธ (Sineth 
, สิเนธ 
) , throughout the world, is a rare last name. The cognomen สิเนธ is habitual in Sri Lanka, where it is quite a rare surname, Cambodia, where it is a very rare surname, and Venezuela. In absolute terms, this name is the most popular in Sri Lanka, Cambodia, and the United States. More frequently, สิเนธ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sineth | Sri Lanka, United Arab Emirates, Cambodia, United States, Tanzania |
| สิเนธ | Thailand |