Surname Önundarson (Önundarson 
) , in the world, is a very rare cognomen. The last name Önundarson is characteristic of Northern Europe, particularly Iceland, where it is quite a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Önundarson | Iceland |
| hrafn önundarson IS (b. 975) |
|
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| eiríkur önundarson Icelandic basketball player, IS (b. 1974) |
|