Cognomen Jachowicz (Jachowicz 
) , across the world, is quite a rare family name. The last name Jachowicz is habitual in Poland, where it is quite a rare surname, Denmark, where it is a rare surname, and Greece, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Poland, the United States, and Brazil. More frequently, Jachowicz is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Jachowicz | Brazil, Canada, United Kingdom, Poland, United States |
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stanisław jachowicz Polish poet (1796-1857), PL (b. 1796) |
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józef jachowicz Polish politician (1862-1941), PL (b. 1862) |
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| eryk józef wojciech jachowicz (b. 1842) |
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władysław jachowicz Captain of the Polish Army, PL (b. 1907) |
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jerzy jachowicz Polish journalist, PL (b. 1938) |
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| natalia jachowicz PL (b. 1879) |
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| ryszard jachowicz PL (b. 1918) |
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| ryszard jachowicz PL (b. 1918) |
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| aleksander jachowicz PL (b. 1928) |
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| ryszard jachowicz Polish engineer, PL (b. 1945) |
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| piotr jachowicz Polish economist, PL (b. 1955) |
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| joanna jachowicz researcher, PL |
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| renata jachowicz researcher |
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| marcin jachowicz researcher (ORCID 0000-0002-6402-6897) |
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| aleksander jachowicz Botanist |
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