Family name Jäck (Jäck 
, Jaeck 
) , all around the world, is quite a rare cognomen. The cognomen Jäck is characteristic of Western Europe, particularly Germany, where it is quite a rare surname, France, and Belgium, where it is a rare surname. In absolute terms, it most frequently occurs in Germany, France, and the United States. Very seldom, Jäck is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Jäck | Myanmar, Germany, South Africa, United States, Algeria |
| Jaeck | Germany, Belgium, Canada, United States, France |
| carl jäck DE (b. 1763) |
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| carl jäck scientific illustrator (1795-1835) (b. 1795) |
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| elsa jäck born 1903-07-08 in Mannheim [DE]; died 1940-01-07 in Reichenau [DE] (b. 1903) |
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regina-elisabeth jäck politician, DE (b. 1956) |
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| alfred jäck Swiss footballer (1911-1953), CH (b. 1911) |
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| ingeborg jäck DE (b. 1912) |
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| ludwig jäck (b. 1935) |
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| hans-martin jäck German biologist (b. 1955) |
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| viola jäck German architect, DE (b. 1968) |
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| berthold jäck researcher (ORCID 0000-0003-3826-0855) |
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Kim, Adrian, Carmen, Daniel, Dieter, Ludwig, Julian, Thomas, Ivonne, Walter, Werner, Ulrich, Manfred, Michael, Andreas, Christa, Cäcilia, Kerstin, Patrick, Darlene, Gertrud, Günter, Andrea, Alfred, Stefan, Simone, Lutz, Nils, Elke, Hans, Alisa, Klaus, Peter, Danny, Georg, Linus, Joachim, Lukas, Jenny, Tanja, Ellen, Edith, Frank, Fritz, Martin, Marcel, Markus, Sabine, Josef, and Jessica