Where does “ecou” come from?

ecou (Romanian) comes from French écho, from Latin echo, from Ancient Greek Ἠχώ, from Ancient Greek ἠχή, from Proto-Hellenic *wākʰā́.

ecou (Romanian): echo

Definitions

Step	Language	Word	Meaning
1	French	écho	echo; rumour
2	Latin	echo	echo
3	Ancient Greek	Ἠχώ	sound; a nymph in Greek mythology
4	Ancient Greek	ἠχή	sound, noise
5	Proto-Hellenic	*wākʰā́	—