Where does “ἠχῶ” come from?

ἠχῶ (Ancient Greek) comes from Ancient Greek ἠχέω, from Ancient Greek ἠχή, from Proto-Hellenic *wākʰā́.

Ancestry of “ἠχῶ”, step by step

StepLanguageWordMeaning
1Ancient Greekἠχέωto sound, ring, peal; to let it sound
2Ancient Greekἠχήsound, noise
3Proto-Hellenic*wākʰā́—
Every word from Proto-Hellenic *wākʰā́ →Every word from Ancient Greek ἠχή →Every word from Ancient Greek ἠχέω →