Surname ธีรสิทธางกูร (ธีรสิทธางกูร 
) , all around the world, is an extremely rare family name. The cognomen ธีรสิทธางกูร is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| ธีรสิทธางกูร | Thailand |