Family name ถิรกุล (ถิรกุล 
, Tirakul 
) , around the world, is a very rare last name. The cognomen ถิรกุล is habitual in Thailand, where it is a very rare surname, India, where it is an extremely rare surname, and the United States. Very seldom, ถิรกุล is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ถิรกุล | Thailand |
| Tirakul | India, United States, Thailand |