Family name Kamkhao (Kamkhao 
) , worldwide, is a very rare cognomen. The last name Kamkhao is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kamkhao | Thailand |
Parjuab, Prajuab, Montakan, Phongsak, and Kitiyaporn