Cognomen Osterc (Osterc 
) , globally, is a rare last name. The family name Osterc is habitual in Slovenia, where it is quite a common surname, Argentina, where it is a rare surname, and Hungary. Measured by absolute frequency, it most frequently occurs in Slovenia, Argentina, and the United States. Much less frequently, Osterc is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Osterc | Argentina, United States, Slovenia, Germany, Hungary |
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slavko osterc Slovenian composer (1895-1941), SI (b. 1895) |
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lidija osterc painter and illustrator (1928-2006), SI (b. 1928) |
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| valerija osterc Slovenian geologist, SI (b. 1924) |
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| jože osterc Yugoslav/Slovenian agronomist and politician, SI (b. 1942) |
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| milan osterc Slovenian footballer, SI (b. 1975) |
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| gregor osterc SI (b. 1968) |
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| andrej osterc SI |
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| aljaž osterc Slovenian ski jumper, SI (b. 1999) |
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Mr, Laura, Lucia, Lucas, Janes, Julia, Tomas, Nacho, Elena, Franc, María, Matias, Mateja, Sabina, Sharon, Srecko, Slavko, Aljaž, Andres, Andrej, Phoebe, Gregor, Duane, Darko, Ralph, Rajko, Ms, Ana, Jan, Mija, Carl, Deja, Luka, Juan, Nada, Eric, Lidija, Ines, Maria, Marta, Marã, Metka, Milan, Staå, Borut, Paula, Pablo, Peter, Ziga, and Javier