Although it was used by the Puritans (along with Dust), it's far too over-the-top and "wordy" for me. It's also slightly depressing because of the phrase "ashes to ashes", as others have pointed out.
Asha or even
Aislin /
Aisling's a better choice for a girl imo. For a boy,
Ashley (which isn't overused for boys at all),
Asher,
Ashton, or perhaps even Ashmead could be used.
Miranda