Cognomen Isav (Исав 
, Isav 
) , around the world, is a very rare family name. The family name Isav is characteristic of Armenia, where it is a rare surname, Russia, where it is an extremely rare surname, and India. Much more frequently, Isav is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Исав | Russia, Armenia, Kazakhstan |
| Isav | Brazil, India, Peru |