Cognomen ถิรโชตยางกูร (ถิรโชตยางกูร 
) , throughout the world, is an extremely rare surname. The cognomen ถิรโชตยางกูร is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| ถิรโชตยางกูร | Thailand |