Surname Onken (Onken 
) , in all the world, is quite a rare last name. The last name Onken is habitual in Germany, where it is quite a rare surname, Switzerland, where it is a rare surname, and Norway. Not in comparison with a country's population, it is commonest in Germany, the United States, and Japan. Very seldom, Onken is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Onken | Germany, Japan, Switzerland, United States, Canada |
| karl eduard onken German artist, 1846-1934, DE (b. 1846) |
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| anton reinhard onken (b. 1846) |
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thomas onken Swiss politician and art historian, CH (b. 1941) |
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| reinhard onken German politician, DE (b. 1891) |
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| günther onken German politician (1901-1970), DE (b. 1901) |
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werner onken German economist, author and editor, DE (b. 1953) |
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| ulfert onken German chemist, DE (b. 1925) |
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| julia onken Swiss writer, CH (b. 1942) |
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| dieter onken (b. 1933) |
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| adam onken (b. 1940) |
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| maya onken Swiss docent and writer, CH (b. 1968) |
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| horst onken (b. 1958) |
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| jan moritz onken German conductor, DE (b. 1977) |
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| anne onken German comedian, DE (b. 1977) |
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| julia onken researcher |
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