Family name อิสยาส (Isayas 
, อิสยาส 
) , all over the world, is a common cognomen. The family name อิสยาส is habitual in Ethiopia, where it is quite a common surname, Philippines, where it is a rare surname, and Saudi Arabia, where it is a very rare surname. Measured by absolute frequency, it is commonest in Ethiopia, Philippines, and India. Likewise, อิสยาส is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Isayas | Sudan, Ethiopia, Philippines, India, Indonesia |
| อิสยาส | Thailand |