Family name Demján (Демьян 
, Demján 
) , throughout the world, is a rare surname. The family name Demján is characteristic of Eastern Europe, particularly Belarus, where it is a rare surname, Slovakia, and Hungary. In absolute terms, the name is most common in Russia, Belarus, and Kazakhstan. More frequently, Demján is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Демьян | Kazakhstan, Ukraine, Belarus, Bulgaria, Russia |
| Demján | Hungary, Slovakia |
| demján oszkár Hungarian swimmer, HU (b. 1891) |
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demján sándor Hungarian businessperson and economist, HU (b. 1943) |
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| demján éva Hungarian actress, HU (b. 1912) |
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| zoltán demján mountain climber, SK (b. 1955) |
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