Last name Tellefsen (Tellefsen 
, Теллефсен 
) , worldwide, is quite a rare surname. The cognomen Tellefsen is habitual in Northern Europe, particularly Norway, where it is quite a common surname, Denmark, where it is quite a rare surname, and Sweden, where it is a rare surname. In absolute terms, it is commonest in Norway, the United States, and Denmark.
| VARIANT | COUNTRY |
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| Tellefsen | Norway, Brazil, Sweden, United States, Denmark |
| Теллефсен | Russia |
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johan christian tellefsen Norwegian musician (b. 1774) |
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thomas tellefsen Norwegian pianist and composer, NO (b. 1823) |
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| carl tellefsen American cross-country skier and ski jumper (b. 1854) |
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rut tellefsen Norwegian actress, NO (b. 1930) |
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tom tellefsen actor (1931-2012), NO (b. 1931) |
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arve tellefsen Norwegian violinist, NO (b. 1936) |
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| arne tellefsen modern pentathlete, NO (b. 1891) |
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| olaf tellefsen Norwegian jurist (b. 1909) |
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| alf kristian tellefsen (b. 1938) |
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| tryggve tellefsen (b. 1941) |
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| christopher tellefsen film editor, US (b. 1957) |
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| jan tellefsen Danish voice actor and musician (b. 1960) |
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| gerry tellefsen college basketball player (1960–1960) Columbia |
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| raymond andre tellefsen researcher |
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| camilla tellefsen Norwegian dancer (b. 1982) |
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