Esmae isn't a spelling mistake. Esme, Esmee and Esmae are all in common use (there's an Esmae in Twilight). I've never met an Esmae though so I don't know if it is pronounced Es-mee or Es-may. I quite like it both ways though.
I've never heard of Aluna. It has a pleasant sound to it but I'd worry about other kids calling her 'a-loner' or 'a-loony'
Based on those two, how about these (I think) fairly unusual names:
Ayla, Aria, Anya, Asia, Asha, Ashleigh, Aubrey, Audrey, Aurora, Amanda, Ariel, April, Briley, Brodie, Bronte, Billie, Bryony, Brenna, Cora, Cara, Calista, Casey, Callie, Connie, Cherry, Claudia, Dulcie, Dixie, Edie, Emery, Ebony, Erica, Faye, Falon, Giselle, Hadleigh, Honey, Hayley, Hetty, Hattie, Isis, Ida, Jessie, Jodi, Kiki, Keltie, Leonie, Leona, Lara, Lana, Livia, Marta, Mala, Mina, Mirren, Nadia, Nia, Nyah, Piper, Polly, Roxie, Romilly, Rowena, Sadie, Susie, Taryn, Talia, Verity, Xanthe, Zia.