Cognomen Onkham (Onkham 
) , in the entire world, is a rare last name. The surname Onkham is characteristic of Thailand, where it is a rare surname, Myanmar, where it is a very rare surname, and the United States, where it is an extremely rare surname. Also, Onkham is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Onkham | Laos, Myanmar, Malaysia, Thailand, United States |