Cognomen Ruhnke (Ruhnke 
) , across the world, is quite a rare last name. The family name Ruhnke is characteristic of Germany, where it is quite a rare surname, the United States, where it is a rare surname, and Switzerland. Measured by absolute frequency, this name is the most popular in Germany, the United States, and France. Very seldom, Ruhnke is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ruhnke | Canada, Poland, France, Germany, United States |
| otto ruhnke (b. 1839) |
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| heinrich-wilhelm ruhnke German politician (SPD) (1891-1963), DE (b. 1891) |
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| august ruhnke DE (b. 1890) |
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| irene ruhnke All-American Girls Professional Baseball League player, US (b. 1920) |
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| martin ruhnke German musicologist, PL (b. 1921) |
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| kent ruhnke Canadian ice hockey player, CA (b. 1952) |
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| michael ruhnke German journalist, DE (b. 1958) |
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| klaus ruhnke German economist and university professor, DE (b. 1963) |
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| michael ruhnke Dr. rer. nat. Albert-Ludwigs-Universität Freiburg im Breisgau 2014 |
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| gregory w ruhnke researcher |
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| leo ruhnke researcher |
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| r. ruhnke researcher ORCID ID = 0000-0002-0353-1603 |
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| markus ruhnke researcher |
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| isabelle ruhnke researcher |
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| timothy r. ruhnke helminthologist |
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