Surname Janacek (Janacek 
) , in all the world, is quite a rare family name. The cognomen Janacek is habitual in Czechia, where it is quite a rare surname, Slovakia, and Austria, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Czechia, the United States, and Slovakia.
| anton janacek (b. 1893) |
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| bedřich janacek Swedish composer and music educator, SE (b. 1920) |
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| ivo janacek (b. 1933) |
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| bruce janacek historian (b. 1961) |
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| roman janacek Austrian politician, AT (b. 1968) |
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| sophie helen janacek researcher |
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| sophie h janacek researcher |
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