Cognomen Langenau (Langenau 
) , globally, is a rare surname. The family name Langenau is characteristic of Germany, where it is a rare surname, South Africa, where it is a very rare surname, and Canada, where it is an extremely rare surname. Not in comparison with a country's population, it most frequently occurs in Germany, the United States, and South Africa.
| VARIANT | COUNTRY |
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| Langenau | South Africa, Canada, United States, Germany |
| johann franz von mariot zu langenau (b. 1663) |
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| ernst heinrich von langenau (b. 1700) |
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| heinrich gottlob von langenau (b. 1706) |
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friedrich karl von langenau Austrian field marshal, DE (b. 1782) |
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| bernhard von langenau (b. 1737) |
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| alois langenau (1747-1809), CH (b. 1747) |
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| friedrich herrmann carl von langenau (b. 1746) |
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ferdinand von langenau Austrian diplomat, AT (b. 1818) |
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| wilhelmine amalie antonie von langenau (b. 1762) |
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| wilhelm von langenau (1787-1860), AT (b. 1787) |
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| amelie von langenau (b. 1833) |
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| martin langenau (b. 1863) |
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jutta langenau East German swimmer (1933-1982), DE (b. 1933) |
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| ute langenau German volleyball player, DE (b. 1966) |
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| david m langenau researcher |
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Mr, Andrew, Annika, Brenna, Birgit, Robert, Roland, Daniel, Edward, Verena, Sabine, Stephan, Deborah, Douglas, Judylyn, Torsten, Benjamin, Kimberly, Patricia, Isabelle, Christine, Andreas, Christelle, Martin, Heike, Ms, Mary, Axel, Kyle, Rico, Lars, Jana, Toni, Erik, Frank, Ursi, Shawn, Craig, Paweł, Peter, David, Diana, Luzil, Niels, Emily, Sarah, and Dave And Brenna