Cognomen Bjarnadottir (Bjarnadottir 
) , globally, is a rare surname. The family name Bjarnadottir is habitual in Northern Europe, particularly Iceland, where it is a common surname, Denmark, where it is a rare surname, and Sweden.
| VARIANT | COUNTRY |
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| Bjarnadottir | Iceland, Norway, Sweden, United States, Denmark |
| kristjana bjarnadottir researcher |
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| ragnhildur i bjarnadottir researcher |
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| ragnheidur i bjarnadottir researcher |
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| helga bjarnadottir researcher |
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| margret bjarnadottir Ph.D. Massachusetts Institute of Technology 2008 |
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| rut bjarnadottir Icelandic association football player, IS (b. 1983) |
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| bryndis bjarnadottir Icelandic association football player, IS (b. 1984) |
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| jorunn bjarnadottir |
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| sandra dögg bjarnadottir Icelandic association football player, IS (b. 1996) |
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Mr, Birna, Diana, Gudny, Linda, Lilja, Jóna, Thora, Ester, Hanna, Helga, Heidi, Heida, Hulda, Frida, Fjola, Olöf, Sigrun, Sigrã, Sigrdur, Brynja, Regina, Birta, Audur, Asdis, Anika, Ms, Ada, Asa, Loa, Una, Alma, Anna, Arna, Katy, Disa, Gudrun, Lena, Elin, Erla, Hlin, Iris, Olã, Maria, Selma, Svana, Svava, Aldis, Jona, and Laufey