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