Last name Mastnak (Mastnak 
) , all around the world, is quite a rare surname. The family name Mastnak is habitual in Slovenia, where it is quite a common surname, Austria, where it is a rare surname, and Croatia. Not in comparison with a country's population, it most frequently occurs in Slovenia, Germany, and Austria.
| VARIANT | COUNTRY |
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| Mastnak | Germany, Austria, France, Slovenia, Argentina |
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miro mastnak SI (b. 1930) |
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| martin mastnak (b. 1912) |
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| tomaž mastnak SI (b. 1953) |
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| wolfgang mastnak AT (b. 1959) |
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| tanja mastnak SI (b. 1962) |
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| matjaž mastnak SI (b. 1963) |
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| martin mastnak AU (b. 1969) |
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| mitja mastnak Ph.D. Dalhousie University 2002 |
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| despina mastnak German association football player, DE |
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| wolfgang mastnak researcher |
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| tinkara mastnak SI |
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| adrijana mastnak SI |
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| jožica mastnak SI |
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| denis mlakar-mastnak SI |
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| jure mastnak SI |
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Mr, Matic, Mojca, Mitja, Sarah, Simon, Boris, Borut, Bruno, Blaž, Marko, Karla, Peter, Denis, Dejan, Dario, Darko, Duska, Laura, Jože, Julia, Pablo, Maria, Žan, Zala, Ms, Ana, Kim, Rok, Eva, Maja, Miha, Susi, Anne, Rose, Rene, Lara, Luka, Juan, Jure, Tina, Nina, Neja, Nejc, Ivan, Igor, Julie, and Jörg