Surname Аивар (Aivar 
, Аивар 
) , throughout the world, is a rare last name. The cognomen Аивар is habitual in Estonia, where it is a rare surname, Peru, and the Dominican Republic. Measured by absolute frequency, the name is most common in Peru, Mexico, and India. Likewise, Аивар is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Aivar | Spain, Estonia, Mexico, India, Peru |
| Аивар | Kyrgyzstan, Kazakhstan, Russia |