Family name ถิรโรจนธร (ถิรโรจนธร 
) , all over the world, is an extremely rare last name. The family name ถิรโรจนธร is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| ถิรโรจนธร | Thailand |