Family name Sitjas (Sitjas 
) , all over the world, is a rare last name. The family name Sitjas is habitual in Spain, where it is a very rare surname, Argentina, and Portugal. Measured by absolute frequency, it is commonest in Spain, Argentina, and France. Likewise, Sitjas is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sitjas | Portugal, China, Spain, Argentina, France |