Etta is gorgeous. I like Ezra and Asa but definitely think Ezra is too similar. Possibly Asa is too but I think you'd get away with it. Roma is sweet. I'm not keen on Margot.
How about:
Astrid, Arwen, Arya, Adele, Ailsa, Alexis, April, Autumn, Briar, Bronte, Brodie, Brynn, Bethan, Bonnie, Bryony, Cara, Cora, Clara, Callie, Carys, Cerys, Celyn, Darcey, Dulcie, Eden, Eilidh, Fleur, Fallon, Felicity, Faye, Giselle, Genevieve, Heidi, Halle, Harmony, Harper, India, Iris, Iona, Juno, Jessamy, Josie, Jemima, Kiran, Keira, Layla, Lyla, Lyra, Lilia, Livia, Lois, Lara, Lana, Lorna, Myla, Mila, Miranda, Minna, Mala, Misty, Nina, Nyah, Nia, Niamh, Ottilie, Pippa, Rhiannon, Rose, Rowan, Ramona, Romilly, Saffron, Sorrell, Sadie, Sasha, Sylvie, Thea, Verity, Xanthe, Zia, Zillah.