Surname Korošec (Korosec 
, Korošec 
) , throughout the world, is quite a rare cognomen. The last name Korošec is habitual in Slovenia, where it is a common surname, Reunion, where it is quite a common surname, and Croatia, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in Slovenia, Croatia, and the United States. Much less frequently, Korošec is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Korosec | Austria, United States, Serbia, Slovenia, Croatia |
| Korošec | Slovenia, United States, Germany, Croatia |
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anton korošec austrian member of Austrian empire council (1872-1940), SI (b. 1872) |
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viktor korošec Slovene legal historian and university teacher (1899-1985), SI (b. 1899) |
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ladko korošec opera singer (1920-1995), SI (b. 1920) |
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tomo korošec Slovenian linguist, SI (b. 1938) |
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štefan korošec SI (b. 1938) |
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| vekoslav korošec (b. 1896) |
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| josip korošec Slovene archaeologist, SI (b. 1909) |
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| paola korošec Slovene archaeologist, SI (b. 1913) |
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| marko korošec (b. 1906) |
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rajko korošec SI (b. 1957) |
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| ivan korošec SI (b. 1913) |
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| vekoslav korošec SI (b. 1914) |
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| janez korošec Slovene politician, SI (b. 1924) |
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| vladimir korošec SI (b. 1920) |
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| evgenija kegl korošec Slovene politician, SI (b. 1931) |
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Ana, Jana, Jaka, Jure, Taja, Tomo, Teja, Tina, Nika, Nina, Nejc, Vili, Ines, Ivan, Ivka, Igor, Žan, Črt, Mario, Marta, Marko, Manca, Luka, Leon, Lara, Lana, Rok, Lea, Jan, Tea, Tia, Nik, Eva, Vid, Iva, Maja, Matic, Miha, Samo, Alen, Alja, Anna, Anja, Anka, Ajda, Kaja, Deni, Dean, Sara, and Matej