My favorite mythological names tend to be Latin (or the Latin version of Greek) or Celtic, but I have a few Greek ones as well...
and I consider them all usable, if not by me then by someone else.
Artemis-for a boy
And would like a lot more if not for there negative connotations.
Scylla - not usable
Ajax - really shouldn't be usable because of the rape thing but it kind of is
Bellerophon - not terribly wearable
My favorite are Leda and Perseus.
Persephone - difficult.
Hero - yes.
Thisbe - yes.
Juno - yes.
Circe - yes.
Andromeda - mostly.
Orion - usable.
Ajax - yes.
But even if it's not usable it could still be very worth it. I'm a firm believer in taking risks.