Cognomen กุศลศิริ (กุศลศิริ 
) , across the world, is an extremely rare family name. The last name กุศลศิริ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Also, กุศลศิริ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| กุศลศิริ | Thailand |