Surname Barnjak (Barnjak 
) , globally, is a rare cognomen. The last name Barnjak is characteristic of Bosnia and Herzegovina, where it is quite a rare surname, Croatia, and Latvia, where it is a rare surname. Not in comparison with a country's population, the name is most common in Bosnia and Herzegovina, Croatia, and Austria. Very seldom, Barnjak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Barnjak | Latvia, Austria, Bosnia and Herzegovina, Croatia, Germany |
| bernard barnjak Yugoslav footballer, BA (b. 1965) |
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| miro barnjak Bosnian actor |
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| leonardo barnjak Bosnia and Herzegovina footballer, BA (b. 1984) |
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| josip barnjak Croatian basketball player, HR (b. 1998) |
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| klara barnjak (b. 1999) |
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Mr, Janja, Jasna, Josip, Jenny, Jerko, Vesna, Vlado, Frane, Ivana, Ivica, Ozren, Marina, Marino, Marija, Martin, Monika, Andrej, Athena, Branko, Birgit, Robert, Lovre, Laura, Davor, Darko, Ana, Ema, Miro, Sara, Anto, Ante, Kata, Roko, Lara, Luka, Renata, Toni, Ivan, Marin, Marko, Saša, Anita, Boris, Bruno, Klara, Petra, Petar, Niko, and Dragan