Cognomen رياس (رياس 
, Reas 
) , around the world, is quite a rare family name. The cognomen رياس is habitual in Philippines, where it is quite a rare surname, Bolivia, and Sudan. Measured by absolute frequency, it is the most numerous in Philippines, Sudan, and the United States. Much less frequently, رياس is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| رياس | Palestinian Territory, Sudan, Morocco, Iraq, Saudi Arabia |
| Reas | Bolivia, Indonesia, Philippines, United States, Saudi Arabia |