Family name Ивар (Ivar 
, Iwar 
, Yvar 
) , in all the world, is quite a rare cognomen. The cognomen Ивар is characteristic of Norway, where it is quite a rare surname, Sweden, and Nigeria, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Nigeria, Norway, and Mexico. More frequently, Ивар is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ivar | Bolivia, India, Sweden, Brazil, Norway |
| Iwar | Nigeria, Malaysia, India, Sweden, Brazil |
| Yvar | Netherlands, Bolivia, United States, Brazil, Mexico |
| Ивар | Kyrgyzstan, Russia, Belarus, Kazakhstan, Ukraine |