Last name Duvnjak (Duvnjak 
, Дувняк 
) , throughout the world, is quite a common cognomen. The surname Duvnjak is habitual in Southern Europe, particularly Croatia, where it is quite a common surname, Bosnia and Herzegovina, and Serbia (explore the name in all countries).
| VARIANT | COUNTRY |
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| Duvnjak | Germany, Serbia, Croatia, Bosnia and Herzegovina, Slovenia |
| Дувняк | Ukraine, Russia |
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domagoj duvnjak Croatian handball player, HR (b. 1988) |
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| georges duvnjak French politician, FR (b. 1953) |
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| ante duvnjak association football player (b. 1956) |
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| željko duvnjak Croatian actor, HR (b. 1963) |
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| antonia duvnjak Ph.D. University of Zagreb 1999 |
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| angella duvnjak researcher |
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| damir duvnjak particle physicist in Australia |
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| sanja duvnjak researcher |
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| stevo duvnjak researcher |
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| marija duvnjak researcher |
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| lea duvnjak researcher |
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| marina duvnjak New Zealand cyclist, NZ (b. 1981) |
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| barbara duvnjak SI |
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| sara duvnjak HR |
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| sandra duvnjak |
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