Cognomen ญาณสาร (Yanasan 
, ญาณสาร , Yannasan ) , in the world, is a rare family name. The surname ญาณสาร is habitual in Thailand, where it is a rare surname, Malaysia, where it is a very rare surname, and Nigeria, where it is an extremely rare surname. Very seldom, ญาณสาร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Yanasan | India, Malaysia, Thailand, United States, Nigeria |
| ญาณสาร, Yannasan | Thailand |