Last name Gylfason (Gylfason 
) , in the entire world, is a rare cognomen. The last name Gylfason is habitual in Iceland, where it is a common surname, Luxembourg, where it is quite a rare surname, and Latvia, where it is a rare surname. Measured by absolute frequency, the name is most common in Iceland, the United States, and Norway.
| VARIANT | COUNTRY |
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| Gylfason | Iceland, Norway, Luxembourg, United States, Latvia |
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þorvaldur gylfason Icelandic economist, IS (b. 1951) |
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| þorsteinn gylfason Icelandic philosopher, musician and poet, IS (b. 1942) |
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| vilmundur gylfason Icelandic politician (1948-1983), IS (b. 1948) |
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brynjar steinn gylfason IS (b. 1999) |
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| gestur gylfason Icelandic association football player, IS (b. 1969) |
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| halldór gylfason Icelandic actor, IS (b. 1970) |
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| ágúst gylfason Icelandic footballer, IS (b. 1971) |
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| magnús gylfason (b. 1967) |
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| gylfi gylfason Icelandic handball player, IS (b. 1977) |
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| arnaldur gylfason researcher |
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| kristinn b gylfason researcher |
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| breki gylfason college basketball player (2019–2019) Appalachian State |
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| konrad gylfason |
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Mr, Hlynur, Felix, Árni, Magnus, Magnús, Sandri, Sölvi, Snorri, Armann, Baldur, Bergur, Birgir, Bjarni, Bjarki, Konrad, Ragnar, Reynir, Gunnar, Guojon, Gísli, Johann, Helgi, Harri, Eyþór, Egill, Bj, Ari, Kã, Gã, Jon, Hã, Aron, Atli, Dadi, Guã, Jónas, Ingi, Andri, Anton, Arnar, Breki, Kári, Daði, Gisli, Gylfi, Einar, Eidur, Omar, and Teitur