Cognomen Jann (珍 
, Jann 
, ヤン 
) , all around the world, is a widespread surname. The last name Jann is characteristic of China, where it is quite a rare surname, Switzerland, and United Arab Emirates. Not in comparison with a country's population, it is the most numerous in China, Pakistan, and Germany. More prevalently, Jann is the forename as well as the last name.
| karl jann (1736-1803), CH (b. 1736) |
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| franz xaver jann DE (b. 1750) |
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| ferdinand jann (1812-1874), CH (b. 1812) |
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| karl jann (1814-1877), CH (b. 1814) |
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| josef jann Czech member of Czech council, regional politician and mayor, CZ (b. 1853) |
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| hans jann DE (b. 1889) |
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werner jann German political scientist, DE (b. 1950) |
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| karl jann (b. 1892) |
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| josef jann Czechoslovak member of Czechoslovak national parliament and Czechoslovak politician, CZ (b. 1911) |
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dominique jann Swiss actor, CH (b. 1977) |
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| ernest jann Luxembourgish association football player, LU (b. 1931) |
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| georg jann German organ builder (1934-2019), DE (b. 1934) |
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| peter jann Austrian jurist, AT (b. 1935) |
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| jann badminton player, AT (b. 1950) |
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| beatrice jann Swiss politician, CH (b. 1952) |
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