Where does “ἐπύλλιον” come from?

ἐπύλλιον (Ancient Greek) comes from Ancient Greek ἔπος, from Ancient Greek ϝέπος, from Proto-Hellenic wékʷos, from Proto-Indo-European wékʷos, from Proto-Indo-European wekʷ- — to speak, to sound out.

ἐπύλλιον (Ancient Greek): versicle, scrap of poetry; epyllion, a short epic...