Etymology

From Proto-Indo-European *h₃osk- (compare Welsh onnen, Latin ornus ‎(“wild mountain ash”), Proto-Germanic *askaz, Russian я́сень ‎(jásenʹ, “ash”), Albanian ah ‎(“beech”), Ancient Greek ὀξύα ‎(oxúa, “beech”), Old Armenian հացի ‎(hacʿi)).