Last name Reinertsen (Reinertsen 
) , in the world, is quite a rare family name. The last name Reinertsen is characteristic of Northern Europe, particularly Norway, where it is quite a common surname, Lithuania, where it is a rare surname, and Denmark. Measured by absolute frequency, it is commonest in Norway, the United States, and Australia.
| VARIANT | COUNTRY |
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| Reinertsen | Norway, South Africa, Australia, United States, Poland |
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emma may alexander reinertsen American writer (1853-1920), US (b. 1853) |
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| aanen reinertsen (b. 1852) |
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tore reinertsen Norwegian writer, NO (b. 1941) |
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sarah reinertsen American triathlete, US (b. 1975) |
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maria reinertsen Norwegian journalist and economist, NO (b. 1980) |
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| trond reinertsen Norwegian businessman, NO (b. 1945) |
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| jon reinertsen Norwegian handball player (b. 1946) |
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| eivind reinertsen Norwegian author (b. 1948) |
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| donald g. reinertsen (b. 1950) |
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| john petter reinertsen Norwegian photographer (b. 1961) |
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| espen reinertsen musical artist, NO (b. 1979) |
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| nathanael reinertsen education researcher |
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| randi eidsmo reinertsen researcher |
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| erik reinertsen researcher |
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| knut reinertsen actor |
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