Aleksa is of Serbian origin, meaning 'defender of mankind'. It's a unisex name, popular among Serbs and other Slavic communities. Aleksa gained international recognition when used by Serbian tennis player Novak Djokovic for his son born in 2017.
"Aleksa's popularity fluctuated over time, peaking with 8 births in 2005. Despite recent declines, it remains a consistent choice with at least five instances every decade."