Cognomen Sigvaldi (Sigvaldi 
) , throughout the world, is an extremely rare family name. The surname Sigvaldi is characteristic of Northern Europe, particularly Denmark, where it is a rare surname. More prevalently, Sigvaldi is the forename as well as the last name.
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| Sigvaldi | Iceland, Spain, Denmark |
| sigvaldi strut-haraldsson semi-legendary chieftain of the fabled Jomsvikings (b. 950) |
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| sigvaldi kaldalóns Icelandic composer and doctor (1881-1946), IS (b. 1881) |
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otto sigvaldi Danish poet and writer (1943-2015), DK (b. 1943) |
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| sigvaldi j. kárason film editor (born 1973), IS (b. 1973) |
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| sigvaldi thordarson researcher |
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| sigvaldi guðjónsson Icelandic handball player, IS (b. 1994) |
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| sigvaldi eggertsson IS |
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Búi, Morris, Kaldalons, Jónsson, Hauksson, Gudjonsson, Gumundsson, Geirmundsson, Thorisson, Einarsson, Orsteinsson, Stefansson, Guðmundsson, Eggertsson, and Gunnarsson