Family name Jančar (Янчар 
, Jančar 
) , throughout the world, is a rare cognomen. The surname Jančar is characteristic of Slovenia, where it is quite a common surname, Czechia, where it is a rare surname, and Croatia. Measured by absolute frequency, it is commonest in Slovenia, Ukraine, and Czechia. Very seldom, Jančar is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Янчар | Ukraine, Russia |
| Jančar | Czechia, Slovenia, Croatia |
| france jančar SI (b. 1820) |
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lizika jančar Slovene partisan, SI (b. 1919) |
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| josef jančar Catholic priest, CZ (b. 1881) |
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| ferdinand jančar SI (b. 1872) |
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| rudolf jančar SI (b. 1914) |
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| jože jančar GB (b. 1920) |
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| václav jančar CZ (b. 1924) |
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| miloš jančar CZ (b. 1929) |
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| matjaž jančar Slovene diplomat, SI (b. 1940) |
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| jan jančar (b. 1937) |
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| janez jančar SI (b. 1945) |
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| vojtěch jančar CZ (b. 1952) |
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| janez jančar SI (b. 1954) |
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| petr jančar CZ (b. 1958) |
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| janez jančar SI (b. 1967) |
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Ana, Tadej, Erika, Filip, Urška, Žiga, Martin, Marjan, Matevž, Michal, Sergej, Alenka, Karmen, Jerica, Jiří, Hannah, Špela, Matjaž, Andraž, Gašper, Lukáš, Tomáš, Jirka, Ondřej, Jurij, Dejan, Rok, Jan, Maja, Miha, Anja, Ajda, Luka, Jaka, Nina, Nejc, Igor, Žan, Marko, Matej, Maša, Mojca, Mitja, Sinja, Simon, Aleš, Peter, Janez, and Jaroslav