Surname Ellefsen (Ellefsen 
) , around the globe, is quite a rare family name. The family name Ellefsen is habitual in Northern Europe, particularly Norway, where it is quite a common surname, Iceland, and Denmark, where it is quite a rare surname. Measured by absolute frequency, it most frequently occurs in Norway, the United States, and Canada.
| VARIANT | COUNTRY |
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| Ellefsen | Denmark, Canada, Norway, Iceland, United States |
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johan ellefsen Norwegian architect (1895-1969), NO (b. 1895) |
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| hans edvard ellefsen Norwegian whaler, NO (b. 1856) |
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| johan ellefsen Norwegian writer (1888-1921) (b. 1888) |
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| sámal ellefsen FO (b. 1886) |
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karen-marie ellefsen Norwegian journalist, NO (b. 1950) |
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| bjarne bystad ellefsen Norwegian architect (b. 1915) |
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håvard ellefsen Norwegian musician, NO (b. 1975) |
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| aslaug ellefsen NO (b. 1919) |
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| gunnar ellefsen Norwegian politician (b. 1930) |
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håvard ellefsen NO (b. 1975) |
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| svend aage ellefsen Danish politician, FO (b. 1941) |
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emil ellefsen Norwegian politician, NO (b. 1994) |
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| trond ellefsen Norwegian association football player (1948-2016) (b. 1948) |
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| vegard ellefsen Norwegian diplomat (b. 1950) |
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| harald ellefsen Norwegian politician, NO (b. 1950) |
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