Last name Fridjonsson (Fridjonsson 
) , all around the world, is a rare family name. The cognomen Fridjonsson is habitual in Northern Europe, particularly Iceland, where it is quite a common surname, Estonia, where it is a rare surname, and Denmark, where it is a very rare surname. Measured by absolute frequency, the name is most common in Northern Europe, particularly Iceland, Denmark, and Norway.
| VARIANT | COUNTRY |
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| Fridjonsson | Norway, Iceland, Estonia, Denmark, United States |
| thordur fridjonsson Icelandic economist, IS (b. 1952) |
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| einar orn fridjonsson researcher ORCID ID = 0000-0001-8365-6002 |
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| olafur fridjonsson researcher ORCID ID = 0000-0002-8725-602X |
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