Last name Ortmann (Ortmann 
) , globally, is a common surname. The family name Ortmann is characteristic of Germany, where it is quite a common surname, Namibia, where it is quite a rare surname, and Austria. In absolute terms, this name is the most popular in Germany, the United States, and Argentina. Much less frequently, Ortmann is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ortmann | Germany, Brazil, United States, Poland, Argentina |
| barbara ortmann (b. 1565) |
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| christoph ortmann (b. 1683) |
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| mathias ortmann Danish joiner, DK (b. 1700) |
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| franciscus ortmann DE (b. 1706) |
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| adolph dietrich ortmann (b. 1718) |
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| johann georg ortmann (b. 1727) |
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| benno ortmann (b. 1752) |
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| anton ortmann botanist (1801-1861), DE (b. 1801) |
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arnold eduard ortmann Prussian-born United States naturalist and zoologist (1863-1927), US (b. 1863) |
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| johann ortmann botanist (1814-1890) (b. 1814) |
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| eduard franz ortmann DE (b. 1831) |
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| karl ortmann German politician (1859-1914), DE (b. 1859) |
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| alfred ortmann DE (b. 1852) |
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| konrad ortmann German educationist and politician (1867-1941), DE (b. 1867) |
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| reinhold ortmann (b. 1859) |
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