Cognomen รัตนจิโรจน์กุล (รัตนจิโรจน์กุล 
) , across the world, is an extremely rare family name. The surname รัตนจิโรจน์กุล is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| รัตนจิโรจน์กุล | Thailand |