Surname Ristau (Ristau 
) , globally, is quite a rare last name. The cognomen Ristau is characteristic of Germany, where it is quite a rare surname, the United States, where it is a rare surname, and Canada. In absolute terms, it most frequently occurs in Germany, the United States, and Brazil. Very seldom, Ristau is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ristau | Canada, Brazil, Poland, United States, Germany |
| paul ristau German politician (1876-1961), DE (b. 1876) |
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| wolfram ristau German diver, DE (b. 1953) |
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| detlev ristau (b. 1957) |
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| hilko ristau German footballer, DE (b. 1974) |
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| benjamin ristau researcher |
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| hans a. ristau Dr. rer. nat. Universität Hamburg 1935 |
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| henry ristau Dr.-Ing. Universität Rostock 2013 |
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| donn albert ristau US zoologist, US |
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| nathali ristau researcher (ORCID 0000-0002-1178-3392) |
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| lukas ristau Dr. rer. nat. Technische Universität Kaiserslautern 2019 |
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| j. ristau researcher ORCID ID = 0000-0002-7363-5205 |
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| tina ristau researcher |
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| peter ristau |
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| daniel ristau DE (b. 1980) |
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| kenneth a. ristau |
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