Family name Sinthuk (Sinthuk 
, สิ้นทุกข์) , around the globe, is a very rare cognomen. The family name Sinthuk is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, Sinthuk is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sinthuk | United States, Thailand |