Worldwide, Željko (Željko 
, Zeljko , Желько 
) is a common masculine forename. The first name Željko is habitual in Southern Europe, particularly Croatia, where it is a prevalent boy's name, Montenegro, where it is a common male name, and Serbia, where it is quite a common masculine name (explore the name in all countries). Not in comparison with a country's population, the name is most common in Croatia, Serbia, and Germany. Very seldom, Željko is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Zeljko, Željko | Bosnia and Herzegovina, Germany, Croatia, Montenegro, Serbia |
| Желько | Ukraine, Russia |
| ז'לקו | Israel |
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željko loparić philosopher, BR (b. 1939) |
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| željko marković Croatian mathematician (1889-1974), HR (b. 1889) |
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| željko kovačevic (*1893-08-06—†1984-03-05) (b. 1893) |
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željko malnar Croatian maverick traveller, writer and a minor television celebrity, HR (b. 1944) |
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željko bebek Bosnian-Herzegovinian singer, HR (b. 1945) |
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željko franulović Croatian tennis player, HR (b. 1947) |
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željko mavrović croatian actor (b. 1947) |
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željko pavličević Croatian basketball coach, HR (b. 1951) |
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željko reiner Croatian politician and physician, HR (b. 1953) |
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željko glasnović Croatian politician, HR (b. 1954) |
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željko mijač Croatian footballer, HR (b. 1954) |
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| željko hegedušić Željko Hegedušić * 22. 7. 1906 , Tuzla , Bosna a Hercegovina (Bosnia and Herzegovina) † 8. 4. 2004 , Záhřeb (Zagreb) , Chorvatsko (Croatia) graphic artist, painter nationality: Croatian sex: male notes: NKP ne 2014/01 (b. 1906) |
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željko ivanek Slovenian–American actor, SI (b. 1957) |
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željko lordanić HR (b. 1948) |
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željko turk Croatian politician, HR (b. 1962) |
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Kos, Popović, Nikolić, Vidović, Vuković, Marković, Mitrović, Barišić, Kovačić, Pavlović, Perković, Petrović, Janković, Jurković, Ivanović, Blažević, Knežević, Jovanović, Vidaković, Filipović, Živković, Martinović, Bošnjak, Šimić, Novosel, Lončar, Kralj, Novak, Marić, Matić, Barić, Babić, Brkić, Kovač, Pavić, Perić, Kovačević, Radić, Jelić, Jurić, Jukić, Tomić, Herceg, Horvat, Mandić, Bašić, Božić, Posavec, Grgić, and Špoljarić