Cognomen Jänsch (Jänsch 
) , all around the world, is quite a rare last name. The family name Jänsch is habitual in Germany, where it is quite a rare surname, and South Africa, where it is an extremely rare surname.
| VARIANT | COUNTRY |
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| Jänsch | Germany, United States, South Africa |
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ernst robert jänsch Prussian mathematician (1817-1892) (b. 1817) |
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| wilhelm jänsch born 1901-08-18 in Sensburg [PL]; died 1981-08-04 in Bonn [DE] (b. 1901) |
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| stephan jänsch researcher |
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| lothar jänsch researcher |
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| judith jänsch (b. 1976) |
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| willy jänsch |
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Max, Maria, Marco, Marko, Malte, Steve, Andre, Arndt, Achim, Claus, Basti, Bernd, Bruno, Karin, Klaus, Petra, Peter, David, Diana, Guido, Georg, Janet, Ines, Erna, Erik, Eric, Jan, Udo, Ute, Uwe, Mark, Mike, Angi, Anja, Caro, Kurt, Jessy, Paul, Rosa, Romy, Rita, Ruth, Dirk, Lina, Lutz, Jana, Nico, Elke, Ralf, and Jörg