Where does “ήλιο” come from?

ήλιο (Greek) comes from New Latin helium, from Ancient Greek Ἥλιος, from Ancient Greek τύπος, from Ancient Greek τύπτω, from Proto-Indo-European (s)tewp-, from Proto-Indo-European (s)tew- — to push, to hit.

ήλιο (Greek): helium; Accusative singular form of ήλιος