Family name Hrastnik (Hrastnik 
) , around the globe, is a rare last name. The cognomen Hrastnik is characteristic of Slovenia, where it is quite a common surname, Croatia, where it is quite a rare surname, and Austria. Very seldom, Hrastnik is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Hrastnik | Austria, Slovakia, Croatia, Slovenia, Germany |
| valentin hrastnik SI (b. 1876) |
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| franz hrastnik AT (b. 1909) |
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| franc hrastnik SI (b. 1935) |
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| denise hrastnik Austrian association football player, AT |
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| claudia hrastnik researcher |
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| jože hrastnik SI (b. 1977) |
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| nataša hrastnik SI |
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| monika hrastnik Slovene cyclist, SI (b. 1994) |
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Mr, Tina, Nina, Hans, Ivan, Žan, Marco, Mateo, Mauro, Majda, Teja, Milan, Sašo, Silva, Sreã, Alojz, Boris, Blaž, Karen, Pablo, Peter, Sanja, Denis, Jaka, Leon, Ms, Ana, Rok, Jan, Taj, Tin, Iva, Masa, Maja, Luka, Sasa, Saã, Alen, Alja, Anja, Anze, Adam, Blaz, Rado, Dino, Saso, and Dejan