Cognomen ธีรรัตนสถิตย์ (ธีรรัตนสถิตย์ 
, Thiraratanasathit , Thirarattanasathit ) , throughout the world, is a very rare family name. The family name ธีรรัตนสถิตย์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Thirarattanasathit, Theerarattanasathit, ธีรรัตนสถิตย์, Thiraratanasathit | Thailand |