Family name Kaczynski (Kaczynski 
, Kaczyński 
, קצ'ינסקי 
) , around the globe, is quite a common last name. The cognomen Kaczynski is habitual in Eastern Europe, particularly Poland, where it is quite a common surname, Slovakia, where it is quite a rare surname, and Belarus. Not in comparison with a country's population, it is commonest in Poland, the United States, and Russia. Likewise, Kaczynski is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kaczynski | Poland, France, Slovakia, United States, Germany |
| Kaczyński | United States, Poland, United Kingdom, Germany |
| קצ'ינסקי | Israel |
| Качинский | Belarus, Kazakhstan, Russia, Ukraine |
Kaczyñski, Kaczyńska, Качински, Качиньский, and Качынская
| rosa kaczynski holocaust victim, b. 1862-12-31, DE (b. 1862) |
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| hulda kaczynski holocaust victim, b. 1866-07-21, CZ (b. 1866) |
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| ernestine kaczynski holocaust victim, b. 1867-03-30, CZ (b. 1867) |
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| josef kaczynski holocaust victim, b. 1869-11-29, PL (b. 1869) |
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| dorothea kaczynski holocaust victim, b. 1878-01-01 (b. 1878) |
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| dora kaczynski holocaust victim, b. 1882-11-08 (b. 1882) |
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theodore kaczynski American domestic terrorist, mathematician and anarchist, US (b. 1942) |
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david kaczynski Brother of convicted serial bomber Ted Kaczynski, US (b. 1949) |
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| theodore richard kaczynski father to Ted Kaczynski, US (b. 1912) |
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andrew kaczynski American journalist, US (b. 1989) |
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| reiner kaczynski German university teacher (1939-2015), DE (b. 1939) |
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| bernice martha kaczynski (b. 1948) |
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| richard kaczynski American writer (b. 1963) |
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| dariusz kaczynski French official |
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| william kaczynski Ph.D. College of William and Mary 2009 |
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