I love Juliet and Miranda.
Other ideas:
Alexis, Aphra, Bryony, Bronwen, Bethan, Bronte, Beatrix, Carys, Cerys, Catrin, Constance, Celest, Carmen, Erin, Erica, Edith, Eirlys, Elowen, Fallon, Ffion, Florence, Grace, Giselle, Genesis, Gretel, Hope, Hebe, Hedda, Isolde, Ingrid, Justine, Jocelyn, Juno, Kiran, Kate, Lillian, Lois, Laurel, Lauren, Maeve, Mirren, Morvern, Mara, Nicole, Niamh, Nadine, Noelle, Olive, Paige, Quinn, Rose, Rhiann, Roisin, Rowan, Robyn, Reagan, Saffron, Sorrell, Sian, Siobhan, Sorcha, Taryn, Tegan, Verity