I knew a half-French
Suzanne Edwina - father or grandfather is/was
Edward.
Edwina is good. Stylish, in a jazz-age way.
Edwina would show her legs right up to the knee, wear fringed clothes and long ropes of beads, and Charleston the night away.
Eddie is a good nn for
Edwina, mostly perhaps because I really don't enjoy it as a male nn. And there's also
Winnie!
I think the best matches as sibs would be
Rufus and
Daphne.
Edwina Lucy Hilda?
Edwina Joan Hilda?
Edwina Ruth Hilda?
Edwina Penelope Hilda - OK, it's a lot, but it does sound lovely.