Surname Баяс (Bayas 
, Baias 
, Баяс 
) , globally, is a common last name. The cognomen Баяс is habitual in Romania, where it is quite a rare surname, Ecuador, and Philippines. Measured by absolute frequency, it is the most numerous in India, Philippines, and Romania. Very seldom, Баяс is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Bayas | Philippines, United States, Ecuador, India, Democratic Republic of the Congo |
| Baias | Romania, Italy, Spain, United States, India |
| Баяс | Kyrgyzstan, Kazakhstan, Armenia, Russia |