I would go Astrid of the two for sure! I also see/hear the Mar and Dar repeat sound and otherwise find Margot to slightly overpower Darcy. Astrid is such a strong and spunky name!
Others (and haven’t looked through others so likely repeats):
Iris
Fleur
Agnes
Eliza
Freya
Frances
Julia
Lydia
Harriet
Ingrid (nn Indi)
Tallulah
Tabitha
Slyvie
Verity
Bryony
Xanthe
Ariadne
Delphine
Seraphine
Florence
Camille/ Camilla
Philippa (nn Pippa)
Ursula (I know, that damned Disney sea witch!)