Dejan (Cyrillic: Дејан) is a South Slavic masculine given name, derived from the Slavic verb dejati, meaning "to act, to do". The name and the derived surname Dejanović are common among South Slavs. The name is first recorded in 1325 (1333) for a voevod of king Stefan Uroš. Notable people. Dejan (fl. 1346-66), Serbian magnate. Dejan Bodiroga (born 1973), Serbian basketball player. Dejan Dabović (1944–2020), Yugoslav water polo player. Dejan Damjanović (born 1981), Montenegrin footballer. Dejan Dimitrovski (born 1979), Macedonian footballer.
https://en.wikipedia.org/wiki/Dejan