Cognomen ייאסו (Iyasu 
, ייאסו 
) , worldwide, is a common last name. The family name ייאסו is habitual in Ethiopia, where it is quite a common surname, Japan, where it is a rare surname, and Nigeria, where it is a very rare surname. Also, ייאסו is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Iyasu | Ethiopia, India, United States, Nigeria, Japan |
| ייאסו | Israel |