Cognomen Halldorsson (Halldorsson 
) , all around the world, is quite a rare last name. The cognomen Halldorsson is characteristic of Northern Europe, particularly Iceland, where it is a common surname, Denmark, where it is quite a rare surname, and Lithuania, where it is a rare surname. In absolute terms, this name is the most popular in Northern Europe, particularly Iceland, Denmark, and Norway.
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| Halldorsson | Denmark, Norway, Iceland, Lithuania, United States |
| hreinn halldorsson Icelandic athletics competitor, IS (b. 1949) |
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| magnus mar halldorsson Ph.D. Rutgers University, New Brunswick 1991 |
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| brynjar halldorsson researcher (ORCID 0000-0003-2108-2669) |
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| thorhallur i halldorsson researcher |
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| steinar halldorsson researcher |
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| gisli h halldorsson researcher ORCID ID = 0000-0001-7067-9862 |
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| jon halldorsson Icelandic Paralympian, IS |
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| skarphedinn halldorsson researcher ORCID ID = 0000-0003-4337-9252 |
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| håkon halldorsson Roman Catholic bishop |
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| vidar halldorsson Icelandic sociologist |
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| halldor halldorsson chess player (b. 1984) |
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| torarinn halldorsson IS |
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Mr, Simon, Sofie, Snaer, Arnar, Bragi, Bjorn, Petur, Runar, David, Daã I, Gisli, Larus, Lorna, Jacob, Tomas, Elias, Ellen, Elvar, Einar, Egill, Hakon, Sarah, Helen, Moses, Olof, Ms, Bo, Sue, Ari, Kim, Pia, Jon, Jen, Tom, Arni, Aron, Adam, Atli, Pall, Dadi, Joey, Jón, Elli, Erik, Hugi, Ingo, Åge, and Helgi