Last name Kostanjevec (Kostanjevec 
) , globally, is a rare cognomen. The cognomen Kostanjevec is characteristic of Southern Europe, particularly Slovenia, where it is quite a common surname, Croatia, where it is quite a rare surname, and Serbia.
| VARIANT | COUNTRY |
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| Kostanjevec | Germany, Austria, Serbia, Croatia, Slovenia |
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josip kostanjevec SI (b. 1864) |
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| ana kostanjevec SI (b. 1878) |
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| boris kostanjevec SI (b. 1958) |
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| tomaž kostanjevec SI |
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| andrej kostanjevec SI |
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| andrea kostanjevec SI |
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| polona kostanjevec SI |
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| boštjan kostanjevec SI |
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| jan kostanjevec SI |
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| stojan kostanjevec SI |
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| martin kostanjevec SI |
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Mr, Žan, Marta, Marko, Mojca, Milan, Mirko, Mitja, Sanja, Simon, Sonja, Aleš, Anica, Chloe, Boris, Borut, Karlo, Katja, Petra, Peter, Roman, Ruža, Ivan, Iris, Ines, Vida, An, Ana, Kai, Lea, Jan, Iva, Ute, Maja, Miha, Sara, Denis, Alen, Boã, Kaja, John, Tomo, Teja, Tina, Niko, Nino, Nejc, Erik, Anja, and David