Cognomen Demmer (Demmer 
) , around the world, is quite a common family name. The cognomen Demmer is habitual in Western Europe, particularly Germany, where it is quite a rare surname, Austria, and Luxembourg. Not in comparison with a country's population, this name is the most popular in Germany, the United States, and France. Much less frequently, Demmer is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Demmer | Austria, South Africa, France, Germany, United States |
| caroline demmer German-Austrian Actress and Singer, DE (b. 1764) |
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| carl demmer German singer, DE (b. 1766) |
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| christian demmer German-Austrian actor and singer, DE (b. 1772) |
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| friedrich demmer Austrian director, AT (b. 1786) |
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| josepha demmer actor and singer (1795-1863), DE (b. 1795) |
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| auguste demmer (b. 1790) |
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| heinrich demmer (b. 1790) |
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| eduard demmer DE (b. 1791) |
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| friedrich demmer DE (b. 1803) |
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| karl gotthold demmer DE (b. 1804) |
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| bernhard demmer (b. 1833) |
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| arnold demmer (b. 1833) |
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| eduard demmer (b. 1837) |
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| fritz demmer Austrian surgeon, AT (b. 1884) |
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| nikolaus demmer (1892-1954) (b. 1892) |
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