In the entire world, Andreja (Andreja 
, Андрея 
, Андрейа ) is a common dominantly female, but uncommonly boy's first name. The given name Andreja is habitual in Croatia, where it is a common female name, Slovenia, where it is quite a common girly name, and Bulgaria, where it is quite a common primarily masculine, but scarcely female name (explore the name in all countries). Much less frequently, Andreja is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Andreja | Sierra Leone, North Macedonia, Serbia, Croatia, Slovenia |
| Андрея | Bulgaria, Russia, Kazakhstan, Ukraine, Belarus |
| Андрейа | Ukraine, Russia, Kazakhstan |
| Андрия | Ukraine, Russia |
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andreja preger Serbian pianist, RS (b. 1912) |
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andreja kocijančič Slovene physician, SI (b. 1942) |
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| andreja deak RS (b. 1889) |
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andreja črnak meglič Slovenian sociologist, politician, SI (b. 1955) |
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andreja jerina Slovene economist, SI (b. 1961) |
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andreja kert Slovenian jurist, SI (b. 1964) |
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andreja katič Slovenian politician, SI (b. 1969) |
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andreja žele SI (b. 1963) |
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andreja mali Slovenian biathlete, SI (b. 1977) |
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| andreja avčin SI (b. 1919) |
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andreja kalc Slovene translator, SI (b. 1979) |
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andreja jernejčič SI (b. 1975) |
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andreja klepač Slovenian tennis player, SI (b. 1986) |
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| andreja milosavljević politician (b. 1936) |
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andreja pejic Australian fashion model, AU (b. 1991) |
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Ar, Kovacic, Lončar, Nikolic, Novosel, Markovic, Pavlovic, Petrovic, Jankovic, Nikolić, Vidović, Vuković, Zivkovic, Marković, Kovačić, Petrović, Potočnik, Jovanovic, Žnidaršič, Stevanovic, Knežević, Djordjevic, Wilson, Živković, Horvat, Ristic, Ak, Ki, Ek, Kos, Nik, Ilic, Savic, Simic, Sever, Babic, Brlek, Kralj, Petek, Golob, Novak, Cvetko, Babić, Bogdan, Kotnik, Kovač, Kranjc, Jurić, and Kovačević