Cognomen Stefánsson (Stefansson 
, Stefánsson , Стефанссон 
) , all over the world, is quite a rare family name. The last name Stefánsson is characteristic of Northern Europe, particularly Iceland, where it is a widespread surname, Sweden, where it is quite a rare surname, and Denmark. Much less frequently, Stefánsson is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Stefánsson, Stefansson | Denmark, Norway, Sweden, Iceland, United States |
| Стефанссон | Ukraine |
| סטפנסון | Israel |
Stefanson, Stefenson, Steffensen, Stephensen, Stephenson, Стефенсон, Стивенсон, ستيفنسون, and スティーブンソン
| ólafur stefánsson Danish lawyer (1731-1812) (b. 1731) |
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| sigurður stefánsson (b. 1744) |
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stefán baldvin stefánsson Icelandic politician (1863-1925), IS (b. 1863) |
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vilhjálmur stefánsson Canadian-born explorer (1879–1962), CA (b. 1879) |
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stefán jóhann stefánsson Prime Minister of Iceland (1894-1980), IS (b. 1894) |
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davíð stefánsson Icelandic poet, novelist and playwright (1895-1964), IS (b. 1895) |
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| dr. jón stefánsson Icelandic writer and academic, IS (b. 1862) |
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| stefán stefánsson botanist (1863-1921) (b. 1863) |
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| sæmundur stefánsson (b. 1859) |
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| jón stefánsson Icelandic-American soldier (b. 1873) |
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| jón stefánsson Icelandic artist, IS (b. 1881) |
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ragnar stefánsson Icelandic seismologist, IS (b. 1938) |
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| halldór stefánsson Icelandic writer and playwright, IS (b. 1892) |
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kári stefánsson Icelandic neurologist, IS (b. 1949) |
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| valtýr stefánsson (b. 1893) |
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Ari, Helgi, Hrafn, Hlynur, Oddur, Unnar, Árni, Óskar, Ómar, Þór, Markús, Magnús, Mikael, Satish, Sindri, Sigmar, Smári, Sölvi, Sævar, Svavar, Arnór, Arnþór, Hafþór, Eyþór, Egill, Einar, Kim, Aron, Atli, Karl, Logi, Jón, Emil, Orri, Örn, Óli, Barði, Andri, Arró, Arnar, Askur, Agnar, Kári, Páll, Jakob, Torfi, Elvar, Elís, Anton, and Baldur