Cognomen Demah (Demah 
) , in the world, is a rare family name. The cognomen Demah is characteristic of Saudi Arabia, where it is a very rare surname, Malaysia, and Indonesia. More prevalently, Demah is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Demah | Indonesia, Saudi Arabia, Syria, Egypt, Jordan |
| prince demah American artist, US (b. 1745) |
|