Cognomen Tønnessen (Tønnessen 
) , across the world, is a rare family name. The surname Tønnessen is characteristic of Northern Europe, particularly Norway, where it is quite a rare surname, Denmark, where it is a rare surname, and Sweden.
| VARIANT | COUNTRY |
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| Tønnessen | Norway, United States, Denmark, Sweden |
Toennessen, Tonnessen, Tønnesen, Tønnesson, and Tønnsen
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johan tønnessen NO (b. 1812) |
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| richard tønnessen (b. 1865) |
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| johan nicolay tønnessen Norwegian historian and schoolteacher (b. 1901) |
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| herman tønnessen Norwegian philosopher (b. 1918) |
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| liv kari bondevik tønnessen Norwegian author (b. 1936) |
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| ida fossum tønnessen Norwegian politician and landscape architect (b. 1942) |
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martine tønnessen (b. 1988) |
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| terje tønnessen Norwegian writer and priest (b. 1949) |
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| grethe mona tønnessen (b. 1946) |
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| geir arild tønnessen Norwegian politician (b. 1959) |
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| aud valborg tønnessen Norwegian historian (b. 1964) |
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| arnfinn tønnessen norwegian psychologist and researcher (b. 1965) |
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| terje tønnessen Norwegian illustrator (b. 1970) |
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| espen tønnessen Norwegian writer (b. 1970) |
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| anne tønnessen Norwegian footballer, NO (b. 1974) |
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Jo, Karl, Rune, Dana, Gunn, Geir, Leif, Lene, Linn, Lisa, Lise, John, Thor, Tina, Elin, Erik, Hans, Finn, Inge, Maria, Marie, Marit, Brit, Arnt, Anja, Anne, Alf, Aud, Aja, Kim, Liv, Jan, Jon, Tor, Tom, Tim, Marny, Eli, Ida, Ole, Ove, Mats, Maud, Mona, Siri, Sune, Sven, Anna, Eva, and Malin