Family name Ratchusupakarn (Ratchusupakarn 
) , in the world, is a very rare cognomen. The family name Ratchusupakarn is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Ratchusupakarn | Thailand |
Sayan, Nutsara, Vatchara, and Nutchanart