Cognomen Mrzljak (Mrzljak 
) , in all the world, is a rare last name. The surname Mrzljak is characteristic of Southern Europe, particularly Croatia, where it is quite a rare surname, Bosnia and Herzegovina, and Slovenia. In absolute terms, this name is the most popular in Croatia, Bosnia and Herzegovina, and the United States.
| VARIANT | COUNTRY |
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| Mrzljak | Germany, Bosnia and Herzegovina, United States, Slovenia, Croatia |
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josip mrzljak Croatian Roman Catholic bishop, HR (b. 1944) |
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filip mrzljak Croatian footballer, HR (b. 1993) |
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| selim mrzljak researcher |
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| anna mrzljak researcher (ORCID 0000-0001-6270-2305) |
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| vedran mrzljak researcher |
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| johann mrzljak |
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| mrzljak petar |
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Mr, Emin, Ivan, Igor, Olga, Maria, Mario, Marko, Mateo, Matea, Matko, Mirna, Samir, Safka, Sinan, Senad, Selma, Semsa, Stela, Armin, Adila, Adnan, Emir, Asima, Emil, Nina, Ms, Ana, Tea, Noa, Edi, Maya, Maja, Mira, Alen, Alma, Anna, Anja, Anka, Amer, Asja, Kata, Rene, Dean, Luka, Luke, Tina, Enes, and Boris