Last name Crnjac (Crnjac 
) , all over the world, is quite a rare cognomen. The last name Crnjac is habitual in Southern Europe, particularly Bosnia and Herzegovina, where it is quite a common surname, Croatia, and Slovenia, where it is quite a rare surname.
| VARIANT | COUNTRY |
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| Crnjac | Austria, Bosnia and Herzegovina, Croatia, Slovenia, Germany |
| ante crnjac SI (b. 1927) |
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| miljenko crnjac (b. 1960) |
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| josip crnjac researcher ORCID ID = 0000-0002-2329-9952 |
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| ivana crnjac Ph.D. University of Zagreb 2019 |
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| anton crnjac SI |
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| pavao crnjac |
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| leila marek-crnjac SI |
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| peter crnjac SI |
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Mr, Tomo, Tony, Toni, Fran, Iris, Ivan, Igor, Zara, Zrin, Maria, Marin, Mario, Marko, Mateo, Matej, Matea, Sanja, Stipe, Andja, Anton, Anita, Jure, Božo, Jozo, Luke, Ms, Mia, Ana, Dea, Tom, Ema, Iva, Zac, Mate, Maja, Mila, Mira, Sara, Alen, Ante, Pera, Rade, Roko, Dado, Lana, Luka, Jana, and Petra