Cognomen Siripajana (Siripajana 
) , throughout the world, is a very rare family name. The family name Siripajana is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Siripajana | Thailand |
Srunyor, Phenbunya, Thanchanok, and Thunchanok