Cognomen ธัญพศิน (ธัญพศิน 
) , in all the world, is an extremely rare family name. The cognomen ธัญพศิน is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. More prevalently, ธัญพศิน is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ธัญพศิน | Thailand |