Cognomen Decombaz (Decombaz 
) , throughout the world, is a very rare family name. The cognomen Decombaz is characteristic of Switzerland, where it is a rare surname, France, where it is a very rare surname, and the United States, where it is an extremely rare surname. Much less frequently, Decombaz is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Decombaz | Switzerland, France, Brazil, United States |
| oscar decombaz French speleologist, FR (b. 1866) |
|