I like Ace and Luna. Less keen on Ophelia and I wouldn't use it if you don't want shortenings as Fee/Fifi is pretty inevitable, I'd say.
How about Axel and ...
Aubrey, Avery, Amber, Blair, Bailey, Bronte, Callie, Cassia, Cleo, Dana, Delphi, Darcey, Eden, Everly, Enya, Fallon, Fern, Fabia, Genesis, Giselle, Georgie, Hallie, Hadley, Hebe, Indie, India, Iona, Juno, Jordan, Juniper, Kiki, Keltie, Kendra, Lola, Lena, Lyra, Mala, Mika, Misty, Nyah, Nova, Nia, Oakley, Piper, Pippi, Peyton, Quinn, Remy, Raine, Raven, Sadie, Stella, Sutton, Tia, Tansy, Taryn, Una, Vita, Veda, Vashti, Wynter, Willa, Xanthe, Zeryn, Zia, Zola
Arlo, Ashley, Aston, Bryn, Brodie, Bodhi, Casper, Colby, Caspian, Dylan, Dexter, Damien, Ellis, Enzo, Emerson, Fitch, Flynn, Ferdi, Harley, Hayden, Hunter, Inigo, Ivan, Ivor, Jesse, Joel, Jonty, Kai, Kyle, Kieran, Logan, Liam, Lucas, Milo, Morgan, Mason, Nico, Nathan, Owen, Otis, Oscar, Parker, Porter, Preston, Quinn, Rio, River, Roka, Solly, Sonny, Spencer, Tanner, Tyler, Tate, Vinnie, Zac, Zen, Zeke