Cognomen Janisch (Janisch 
, Яниш 
) , in the entire world, is quite a common surname. The last name Janisch is habitual in Austria, where it is quite a common surname, Germany, where it is quite a rare surname, and Czechia, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Germany, Austria, and the United States. Much less frequently, Janisch is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Janisch | Austria, Brazil, Germany, United States, Czechia |
| Яниш | Ukraine, Russia |
| joachim christoph janisch DE (b. 1747) |
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antonie janisch Austrian actress (1848-1920), AT (b. 1848) |
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karl janisch German engineer (1870-1946), DE (b. 1870) |
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| carl janisch botanist (1825-1900) (b. 1825) |
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| eduard janisch (b. 1868) |
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| ernst janisch entomologist (1892-1960) (b. 1892) |
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| jerzy janisch painter (1901-1962), UA (b. 1901) |
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| theodor janisch sport shooter, AT (b. 1902) |
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janisch attila Hungarian film director, HU (b. 1957) |
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| rudolf janisch (b. 1897) |
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| heinrich janisch (b. 1900) |
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| oswald janisch DE (b. 1901) |
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| andreas janisch (b. 1906) |
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| jaroslav janisch CZ (b. 1908) |
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| josef janisch AT (b. 1909) |
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