I like Miranda and Mimi
Cordelia is a bit fancy and Coco cute for a little girl but not for an adult
I'm meh about Lucinda but really like Lucy
Faye and Freya are both ok.
Short traditional but contemporary ideas that could go with Isla:
Anna, Alexa, Abigail, Bethan, Bonnie, Bella, Carla, Clara, Cara, Connie, Claire, Daisy, Diana, Ella, Eva, Emma, Elsa, Elise, Esme, Erin, Faith, Flora, Grace, Hannah, Hope, Lydia, Lottie, Libby, Lucy, Mary, Martha, Nicole, Phoebe, Ruby, Rachel, Sophie, Sadie, Sorrell, Summer, Tessa, Thea, Tara, Violet.