Family name ธีร์จิรัญญ์ (ธีร์จิรัญญ์ 
) , in the world, is an extremely rare surname. The cognomen ธีร์จิรัญญ์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| ธีร์จิรัญญ์ | Thailand |