Echo, the pretty, resonant name of a legendary nymph, was the heroine of Joss Whedon's sci-fi series Dollhouse. Nick Hexum, of the band 311, named his daughter Echo Love.

Although this is traditionally seen as a female name, via the classical mythological nymph who pined away for Narcissus until all that remalined of her was a disembodied voice--it can also be used for boys. Remember that old song, 'Little sir echo, how do you do?'