Nope, mind has not been changed, so far!!, we do both love Daphne, the fact it is currently not so popular is a bonus, in our opinion. I would say it was a 30s, rather than 70s name. Although the 30s via the 70s are having a boom at the mo in fashion circle, then Daphne is on the pulse!
Olive,( I do love Olive too, but dh not) my mother is`Penelope, which is beautiful, but would be too confusing to have 2 of them.
redstripe, a nephew is Nathaniel, so that's out.
I do rather like Delphine, though to me, it's difficult to say without a southern American twang, and Daphne trumps it.
Iris and Violet together would be a bit too twee? and little Irises are not unknown around this neck-of-the woods, also know a Hermione, many Charlottes and an Isobel.
To me, Daphne conjurs up a diaphanous nymph, yet has gumption too, it's a happy name. Any Future dd is going to have a crown of dark curls, like her elder sister, and, for me, that would suit her down-to-the ground.
Keep on trying! I love to hear your ideas!!