Worldwide, Dejan (Dejan 
, ديان 
, Дејан , among others...) is a common masculine forename. The forename Dejan is characteristic of Southern Europe, particularly Montenegro, where it is a common boy's name, Serbia, and Croatia (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in Southern Europe, particularly Serbia, Croatia, and Bosnia and Herzegovina. Much less frequently, Dejan is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Dejan | Bosnia and Herzegovina, Croatia, Slovenia, Serbia, North Macedonia |
| ديان | Iran, Yemen, Sudan, Iraq, Saudi Arabia |
| Дејан | Serbia |
| 德扬 | China |
| Деян | Ukraine, Russia, Bulgaria, Belarus |
| דיאן | Israel |
| Дежан | Russia |
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dejan subotić AT (b. 1852) |
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dejan medakovic Serbian writer (1922-2008), RS (b. 1922) |
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| dejan dubajić Yugoslav actor and singer, HR (b. 1897) |
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dejan ilic Serbian scientist, DE (b. 1957) |
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dejan stanković Austrian football player, AT (b. 1957) |
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dejan stojanović poet, writer, and businessman, XK (b. 1959) |
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dejan verčič Slovenian academic, SI (b. 1963) |
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dejan matić Serbian actor, RS (b. 1963) |
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dejan tiago stankovic Portuguese writer, PT (b. 1965) |
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dejan židan Slovenian politician, SI (b. 1967) |
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dejan vukićević Montenegrin football manager and former player, ME (b. 1968) |
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dejan jović Croatian political scientist, HR (b. 1968) |
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dejan prešiček Slovenian musician, SI (b. 1970) |
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dejan orešković Croatian guitarist, HR (b. 1970) |
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dejan terzic German drummer, DE (b. 1970) |
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Ilic, Ivanovic, Zivkovic, Milosevic, Stankovic, Cvetkovic, Kovacevic, Jovanovic, Todorovic, Filipovic, Marinkovic, Marjanovic, Maksimovic, Mihajlovic, Mladenovic, Stefanovic, Stevanovic, Stanojevic, Stojanovic, Djordjevic, Milovanovic, Radovanovic, Jankovic, Dimitrijevic, Petkovic, Pavlovic, Maric, Savic, Simic, Antic, Lazic, Lukic, Jovic, Tomic, Vasic, Kostic, Krstic, Ristic, Djokic, Djuric, Horvat, Aleksic, Popovic, Nikolic, Markovic, Mitrovic, Knezevic, Petrovic, and Milosavljevic