Family name Thorleifsson (Thorleifsson 
) , around the world, is a rare cognomen. The last name Thorleifsson is habitual in Northern Europe, particularly Iceland, where it is quite a common surname, Norway, where it is quite a rare surname, and Denmark, where it is a rare surname.
| VARIANT | COUNTRY |
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| Thorleifsson | Denmark, Norway, Sweden, Iceland, Switzerland |
| jón thorleifsson IS (b. 1891) |
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| renie thorleifsson Norwegian journalist (b. 1958) |
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| tellef thorleifsson (b. 1962) |
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| gudmar thorleifsson researcher (ORCID 0000-0003-4623-9087) |
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| berit marie thorleifsson researcher (ORCID 0000-0002-2833-8930) |
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| sigurdur james thorleifsson researcher |
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| gudmar thorleifsson researcher |
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| helgi thorleifsson Ph.D. Georg-August-Universität Göttingen 1987 |
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| cathrine thorleifsson Norwegian social anthropologist and researcher, US (b. 1982) |
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| hanus thorleifsson Danish association football player, FO (b. 1985) |
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| andrés thorleifsson Icelandic-born Swedish footballer, SE (b. 1988) |
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| nikolina thorleifsson |
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