Family name Birnir (Birnir 
) , all over the world, is a rare surname. The last name Birnir is habitual in Iceland, where it is quite a rare surname, Ethiopia, where it is a very rare surname, and Norway. Much less frequently, Birnir is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Birnir | Norway, Iceland, Ethiopia, United States, Denmark |
| björn birnir (b. 1953) |
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| björn birnir Ph.D. New York University 1981 |
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| bryndis birnir researcher ORCID ID = 0000-0002-1763-0266 |
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| birnir sigurðarson Icelandic rapper, IS (b. 1996) |
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| birnir snaer ingason Icelandic footballer, IS (b. 1996) |
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Magna, Bjorn, Einar, Olafur, Bjartmar, Johanna, Ingimundur, and Hallfridur