Surname Sedlak (Sedlak 
, Sedlák 
, Седлак 
) , in the entire world, is a common cognomen. The last name Sedlak 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 the most numerous in Czechia, Slovakia, and the United States. Much less frequently, Sedlak is the forename as well as the last name.
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| Sedlak | Germany, Slovakia, Czechia, Poland, United States |
| Sedlák | Germany, Hungary, Slovakia, Czechia, United States |
| Седлак | Kazakhstan, Russia, Ukraine |
| johann sedlak pastor, AT (b. 1820) |
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| karl sedlak CZ (b. 1862) |
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| hanns sedlak AT (b. 1873) |
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elena sedlak Italian actress, IT (b. 1938) |
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| fritz sedlak Austrian musician (1895-1977), AT (b. 1895) |
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| adolf sedlak * 7.8.1901 Wien, † 31.8.1979 Wien. Musikpädagoge. (b. 1901) |
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| włodzimierz sedlak Polish biochemist, PL (b. 1911) |
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nikola sedlak Serbian chess player, RS (b. 1983) |
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| erich sedlak Austrian writer (1947-2018), AT (b. 1947) |
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lukas sedlak football player, DE (b. 1999) |
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| luboš sedlak badminton player, CZ (b. 1951) |
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| david sedlak researcher ORCID ID = 0000-0003-1686-8464 (b. 1964) |
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| petr sedlak (b. 1969) |
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| david sedlak professor, US |
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| adam b sedlak researcher |
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