Last name Demjén (Demjen 
, Demjén 
) , around the globe, is quite a rare cognomen. The last name Demjén is characteristic of Eastern Europe, particularly Hungary, where it is quite a rare surname, Slovakia, and Romania, where it is a rare surname. Much less frequently, Demjén is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Demjen | Canada, Romania, Slovakia, United States, Hungary |
| Demjén | Romania, United Kingdom, Hungary |
| demjén lászló HU (b. 1836) |
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| demjén mari actress, HU (b. 1857) |
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| demjén lászló HU (b. 1864) |
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demjén gyöngyvér Hungarian actress, HU (b. 1940) |
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demjén ferenc Hungarian singer, lyricist, bass guitar player, HU (b. 1946) |
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| demjén istván HU (b. 1888) |
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| demjén attila Hungarian painter (1926-1973), HU (b. 1926) |
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demjén gábor Hungarian association football player, HU (b. 1986) |
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| demjén istván Hungarian musician, HU (b. 1938) |
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| demjén istván HU (b. 1933) |
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demjén patrik association football player, HU (b. 1998) |
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| demjén mihály Hungarian actor, HU |
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Alex, Gábor, Józsi, János, Tamás, Tímea, Noémi, Ferenc, Ádám, Ágnes, Melinda, Mónika, Sándor, Szabina, Szilvia, András, Klaudia, Dominik, Dániel, Levente, József, Norbert, Gergő, Dávid, Dušan, Rózsa, Anna, Kata, Ági, Éva, Kitti, Kíra, Dóra, Luigi, Judit, Nikol, István, Vicky, Zsolt, Ákos, Monika, Márta, Szimóna, Anikó, Attila, Beáta, Péter, Roland, Ottó, and Zoltán