Throughout the world, Guðni (Guðni 
, גודני 
) is a very rare masculine first name. The first name Guðni is characteristic of Northern Europe, particularly Iceland, where it is quite a common masculine name. Much less frequently, Guðni is the last name as well as the forename.
| guðni sigurðsson (b. 1714) |
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| guðni jónsson Icelandic historian (1901-1974), IS (b. 1901) |
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guðni thorlacius jóhannesson President of Iceland (2016-present), IS (b. 1968) |
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| guðni jónsson association football player (b. 1943) |
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| guðni kjartansson Icelandic football player and manager, IS (b. 1946) |
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| guðni ágústsson Icelandic politician, IS (b. 1949) |
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| guðni jóhannesson (b. 1951) |
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| guðni ólafur guðnason Icelandic basketball player, IS (b. 1965) |
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| guðni bergsson Icelandic footballer, IS (b. 1965) |
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| guðni rúnar helgason Icelandic association football player, IS (b. 1976) |
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| guðni halldórsson IS (b. 1974) |
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| guðni finnsson IS |
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| guðni guðnason |
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| guðni sigmundsson thorlacíus |
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| guðni valur guðnason Icelandic athletics competitor, IS (b. 1995) |
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Thor, Hjörleifsson, Oddgeirsson, Ólafsson, Þorvaldsson, Þorsteinsson, Matthíasson, Sigurðsson, Pétursson, Davíðsson, Guðmundsson, Grétarsson, Halldórsson, Walderhaug, Ágústsson, Ásgeirsson, Sigurjónsson, Kristinsson, Ragnarsson, Gunnarsson, Haraldsson, Þórarinsson, Hannesson, Þórðarson, Eiríksson, Erlendsson, Valur, Þór, Lárusson, Ægisson, Sæmundsson, Pálsson, Leifsson, Jónsson, Tómasson, Harðarson, Hauksson, Helgason, Oddsson, Björnsson, Kárason, Guðnason, Guðjónsson, Guðfinnsson, Gíslason, Jónasson, Thorarensen, Einarsson, and Kristjánsson