Surname Tharasai (Tharasai 
) , in all the world, is an extremely rare family name. Much more frequently, Tharasai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tharasai | Thailand |
Ramsiri, Sangpakdee, Kaewmeechai, Chaiyasit, and Dumrongwang