All over the world, Halvdan (Halvdan 
, Халвдан) is a very rare masculine first name. The given name Halvdan is habitual in Northern Europe, particularly Norway, where it is a rare male name, and Sweden. Much less frequently, Halvdan is the last name as well as the forename.
| halvdan kvitbein semi-legendary Norwegian petty king, NO (b. 601) |
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halvdan svarte ninth-century king of Vestfold, NO (b. 810) |
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halvdan ragnarsson Viking leader and commander of the Great Heathen Army, SE (b. 900) |
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| halvdan hålegg Viking warrior, GB (b. 850) |
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halvdan koht Norwegian historian and politician (1873-1965), NO (b. 1873) |
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halvdan eyvind stokke Norwegian politician (1900-1977), NO (b. 1900) |
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halvdan holbø Norwegian artist (1907-1995) (b. 1907) |
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| halvdan aarsrud Norwegian politician (b. 1878) |
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halvdan ljøsne Norwegian artist (1929-2006), NO (b. 1929) |
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| halvdan wexelsen freihow Norwegian priest and culturist, NO (b. 1883) |
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halvdan skard Norwegian politician (b. 1939) |
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halvdan sivertsen Norwegian musician, NO (b. 1950) |
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| halvdan møller Norwegian journalist, NO (b. 1900) |
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| halvdan karterud (b. 1894) |
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| halvdan halse Norwegian teacher (1904-1982) (b. 1904) |
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