Cognomen Khamsao (Khamsao 
) , in the world, is a rare last name. The cognomen Khamsao is characteristic of Laos, where it is quite a rare surname, Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname. Likewise, Khamsao is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Khamsao | United States, India, Thailand, Laos, Canada |