Family name Rungthongkhamkul (Rungthongkhamkul 
) , around the globe, is a very rare surname. The cognomen Rungthongkhamkul is characteristic of Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Rungthongkhamkul | United States, Thailand |