Daphne. Hands down. Cheerful, floral and friendly. OK, it can shorten to Daffy, but that's not the worst thing that can happen, or even inevitable.
Daniel is one of my favourite male names, but
Danielle with that thumping YELL for a last syllable is a disappointment. And, like
Gabrielle, it's been getting quite a lot of use here recently, so it's hard to escape it.
Delilah ... I don't mind naughty biblical ladies, not at all, but that wailing
Tom Jones song is enough to make me consider voluntary deafness.