Surname Sonnichsen (Sonnichsen 
) , in all the world, is a rare family name. The family name Sonnichsen is characteristic of Denmark, where it is quite a rare surname, Canada, where it is a rare surname, and Norway, where it is a very rare surname. Not in comparison with a country's population, it is commonest in the United States, Denmark, and Canada. Very seldom, Sonnichsen is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sonnichsen | Germany, Australia, United States, Canada, Denmark |
Sønnichsen, and Сонничсен
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albert sonnichsen American journalist, US (b. 1878) |
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| yngvar sonnichsen American artist (1873-1938), US (b. 1873) |
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| c.l. sonnichsen American historian (b. 1901) |
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| autumn sonnichsen American photographer, US |
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| sarah holst sonnichsen Danish archer (b. 1995) |
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