From the Greek word
ἠχώ (echo) meaning
"echo, reflected sound", related to
ἠχή (eche) meaning "sound". In Greek
mythology Echo was a nymph given a speech impediment by
Hera, so that she could only repeat what others said. She fell in love with
Narcissus, but her love was not returned, and she pined away until nothing remained of her except her voice.