Family name Kostmann (Kostmann 
) , all over the world, is a rare last name. The last name Kostmann is habitual in Austria, where it is quite a rare surname, Slovenia, where it is a rare surname, and Germany. Measured by absolute frequency, this name is the most popular in Western Europe, particularly Germany, Austria, and France. Much less frequently, Kostmann is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kostmann | Germany, Sweden, Austria, France, Slovenia |
| ignatz kostmann holocaust victim, b. 1875-06-15, AT (b. 1875) |
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gerd rüdiger kostmann German association football player, DE (b. 1941) |
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marco kostmann German association football player, DE (b. 1966) |
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Mr, Julia, Tomas, Nolan, Horst, Martin, Markus, Malina, Maxime, Monika, Simone, Sophie, Schmid, Sylvie, Alyssa, Celina, Birgit, Pascal, Petter, Romain, Roland, Didier, David, Peter, Klaus, Karin, Ms, Guy, Jan, Mark, Mats, Maud, Anna, Anja, Aron, Dirk, Lucien, Lisa, Jean, Ebba, Hans, Fred, Olaf, Marie, Marco, Sarah, Serge, Anais, Loic, and Jannik