Cognomen ถวิลนอก (Longing 
, ถวิลนอก 
, Thawinnok ) , around the world, is a rare last name. The surname ถวิลนอก is habitual in Saudi Arabia, where it is a rare surname, Thailand, and Georgia, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in Thailand, the United States, and Saudi Arabia. Likewise, ถวิลนอก is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Longing | China, Saudi Arabia, United States, India, Myanmar |
| Thawinnok, ถวิลนอก | Thailand |