Where does “ecco” come from?

ecco (Medieval Latin) comes from Latin echo, from Ancient Greek Ἠχώ, from Ancient Greek ἠχή, from Proto-Hellenic *wākʰā́.

Ancestry of “ecco”, step by step

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