Family name ทัศนาธาร (ทัศนาธาร 
, Tassanatharn ) , around the world, is an extremely rare cognomen. The surname ทัศนาธาร is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Also, ทัศนาธาร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tassanatharn, ทัศนาธาร | Thailand |