Cognomen Machacek (Machacek 
, Macháček 
) , all around the world, is quite a common family name. The cognomen Machacek is habitual in Czechia, where it is quite a common surname, Slovakia, and Austria, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in Czechia, Slovakia, and the United States.
| fritz machacek Homosexual Nazi victim, DE (b. 1899) |
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herbert machacek Austrian politician, AT (b. 1949) |
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| john emil machacek botanist (b. 1902) |
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alex machacek Austrian jazz musician, AT (b. 1972) |
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| rudolf machacek AT (b. 1927) |
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| john machacek American journalist, US (b. 1940) |
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| jan machacek Austrian video artist and performance artist, AT (b. 1975) |
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| c. machacek researcher |
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| jennifer machacek researcher |
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| matthias machacek researcher |
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| roman machacek Ph.D. Technical University of Ostrava 2001 |
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| marie machacek American astrophysicist |
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| joshua machacek researcher |
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| john machacek Ph.D. Michigan State University 2018 |
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