Surname ธีรศาสตร์ (ธีรศาสตร์ 
, Theerasat , Thirasat 
) , worldwide, is a rare last name. The cognomen ธีรศาสตร์ is habitual in Thailand, where it is a rare surname, Germany, where it is an extremely rare surname, and India. Also, ธีรศาสตร์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ธีรศาสตร์, Teerasat, Theerasat | Thailand |
| Thirasat | Germany, India, Thailand |