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