Aleksej is a ♂ male name.
Aleksej is a Russian, Bulgarian and Slovene form of the Greek names Aléxios / Αλέξιος or Aléxis / Ἀλέξις and corresponds to the name Alexis.
Aleksej means “defender” or “helper” (from ancient Greek “aléxein/ἀλέξειν” = to defend/help).