I think
Delphine is lovely (though I prefer it as a mn for some reason), esp. with the nn
Della. I think it sounds great with
Xanthe,
August, and
Anneliese. But
Alcyone seems to 'stick out' a little bit to me, but if
Alcyone is brought back in then
Anneliese almost seems boring next to the others.
Some mn suggestions:
Delphine EliseDelphine GiseleDelphine AdeleDelphine Camille (it's easier to pair with other French names, obviously...lol)