Cognomen จำนงค์ (Chamnong 
, Jumnong 
, Jamnong 
) , across the world, is quite a rare family name. The last name จำนงค์ is habitual in Thailand, where it is quite a rare surname, Australia, where it is a rare surname, and Malaysia, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Thailand, Australia, and the United States. More frequently, จำนงค์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Chamnong | Thailand, Netherlands, United States, Malaysia, India |
| Jumnong | United States, Malaysia, Australia, Thailand |
| Jamnong | Thailand, United States, Sweden, Malaysia, China |
Chamnankhong, Chamnankon, Chamnankong, Chamnansong, Chamniang, Chamnoiphom, Chamnoknan, Chamnongkam, Chamnongruck, Chamnongsong, Chamnonk, Chumnong, Chumnongsong, Jamnaimaung, Jamnongrk, Jamnongsong, Jamnonk, Jhamnong, Jhumnong, Jumnok, Jumnongkum, Jumnonk, Jumnun, Jumnung, Khumnong, Ratjumnong, and Want