Globally, Деян (Dejan 
, Deyan 
, Деян 
) is a common boy's first name. The forename Деян is habitual in Southern Europe, particularly Montenegro, where it is a common boy's name, Croatia, and Serbia (explore the name in all countries). Measured by absolute frequency, it is the most numerous in Southern Europe, particularly Serbia, Croatia, and Bosnia and Herzegovina. Very seldom, Деян is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Dejan | North Macedonia, Serbia, Bosnia and Herzegovina, Croatia, Slovenia |
| Deyan | Philippines, Bulgaria, Serbia, United States, Indonesia |
| Деян | Ukraine, Russia, Bulgaria, Belarus |
| Deian | Bulgaria, United States, France, Romania, Germany |
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деян енев Bulgarian writer, BG (b. 1960) |
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деян неделчев Bulgarian pop singer, showman and composer, BG (b. 1964) |
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деян каменов Bulgarian singer, BG (b. 1983) |
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деян лозев Bulgarian footballer, BG (b. 1993) |
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| деян бонев Bulgarian canoeist, BG (b. 1967) |
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| деян цаков Bulgarian association football player (1969-), BG (b. 1969) |
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| деян вълков Bulgarian painter, BG (b. 1971) |
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| деян донков Bulgarian actor, BG (b. 1974) |
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| деян божков Bulgarian chess grandmaster, BG (b. 1977) |
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| деян ангелов Bulgarian actor, BG (b. 1980) |
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| деян моллов Bulgarian officer and policeman, BG (b. 1980) |
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| деян христов Bulgarian footballer, BG (b. 1983) |
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| деян статулов BG (b. 1973) |
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| деян дешков BG (b. 1975) |
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| деян иванов Bulgarian basketball player, BG (b. 1986) |
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Илич, Трайков, Шипетич, Манолов, Ангелов, Драгушин, Николов, Василев, Великов, Соколов, Станчев, Стоянов, Тодоров, Христов, Младенов, Неделчев, Йорданов, Атанасов, Георгиев, Григоров, Димитров, Стефанов, Стойков, Вучкович, Шушняр, Славов, Янев, Йотов, Колев, Боянов, Ганев, Денев, Делев, Деянов, Димов, Нинов, Джорджевич, Васич, Илиев, Рачич, Асенов, Велков, Костов, Петров, Петков, Добрев, Дончев, Иванов, Летич, and Александров