Cognomen Joannis (Ян 
, Joannis 
) , in the world, is quite a common surname. The family name Joannis is habitual in Kazakhstan, where it is quite a rare surname, Armenia, and Belarus. Measured by absolute frequency, it most frequently occurs in Russia, Kazakhstan, and Ukraine. More frequently, Joannis is the forename as well as the last name.
| andreas joannis (b. 1550) |
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| georg christian joannis German historian, DE (b. 1658) |
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| mathieu joannis FR (b. 1754) |
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| léon de joannis French entomologist and ichthyologist, FR (b. 1803) |
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| jean alexandre joannis French mathematician and physicist (1857-1931), FR (b. 1857) |
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| joseph de joannis French entomologist, FR (b. 1864) |
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| jeanne de joannis ES (b. 1877) |
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| henri joannis born:1928-03-19|died:2009|; Joannis, H.; Joannis, Henri; Joannis, Henri 1928-2009, FR (b. 1928) |
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| ludovico joannis Roman Catholic bishop |
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| domenico joannis Roman Catholic bishop |
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| philippos joannis Dr. phil. Ludwig-Maximilians-Universität München 1836 |
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| claudette joannis |
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| laurentius joannis SE |
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| joseph joannis |
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| david guy joannis CA |
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