Family name Janetschek (Janetschek 
, Янечек 
) , throughout the world, is a rare cognomen. The family name Janetschek is characteristic of Austria, where it is quite a rare surname, Germany, where it is a rare surname, and Estonia. Not in comparison with a country's population, it is commonest in Germany, Austria, and Russia.
| VARIANT | COUNTRY |
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| Janetschek | United States, Czechia, Germany, Austria, Spain |
| Янечек | Ukraine, Russia, Kazakhstan |
| alois janetschek (b. 1850) |
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| clemens d’elpidio janetschek CZ (b. 1857) |
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| edwin janetschek CZ (b. 1882) |
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| ottokar janetschek AT (b. 1884) |
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| heinz janetschek entomologist, AT (b. 1913) |
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| otmar janetschek (b. 1913) |
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| albert janetschek AT (b. 1925) |
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| karl janetschek Austrian chess player, AT (b. 1940) |
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| kurt janetschek AT (b. 1930) |
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| günter janetschek (b. 1949) |
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| hubert janetschek |
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Mr, Denise, Daniel, Dustin, Thomas, Hannah, Hubert, Ursula, Michael, Andreas, Carolin, Darlene, Jürgen, William, Maryanne, Benjamin, Christine, Elizabeth, Robert, Maximilian, Birgit, Sylvia, Ms, Liz, Jã, Mary, Shar, Axel, Gert, Lynn, Ingo, Antje, Bernd, Peter, Lukas, Emily, Harry, Frank, Milena, Andrea, and Dustin Sebastian