Oh, I love Lara. And Lara Adeline is perfect. Beautiful name. I'd stick with it.
But, if you want other, similar ideas, how about:
Aria, Anya, Bronte, Cara, Cassia, Delphi, Elina, Enya, Eden, Effie, Esme, Farrah, Fallon, Faith, Giselle, Hanna, Honor, Iona, Iris, Ivy, Katya, Kiera, Keziah, Kendra, Lyra, Lena, Lila, Livia, Lydia, Lorna, Mila, Mika, Mala, Mirren, Marin, Nia, Nyah, Nala, Noelle, Pippa, Priya, Romy, Rowena, Rosina, Robyn, Sorrel, Saffron, Stella, Sylvia, Tara, Tansy, Tegan, Tamsin, Una, Vashti, Verity, Willow, Xanthe, Yasmin, Zara, Zia, Zeryn