Cognomen Rajphangthong (Rajphangthong 
) , throughout the world, is an extremely rare family name. The last name Rajphangthong is habitual in New Zealand, where it is a very rare surname, Canada, where it is an extremely rare surname, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Rajphangthong | New Zealand, Canada, United States |