Was wondering if anyone knew the feminization of Etienne (Etienna? I don't know if that looks right?!).
And I am not so keen on Estephanie:)
It's not actually from Etienne (which has actually been on my boy's list before), but Etain is a possible honouring/similar name you might like. It is the name of a beautiful fairy from Irish mythology who was turned into a fly/butterfly (according to Nameberry), and although the meaning - 'jealousy' - isn't very nice, I think the sound is lovely. It's also sometimes associated with the Celtic sun goddess, apparently, as well. Good luck - Stephanie is always another option.
I went to college with an Etain and I always thought it was a beautiful name.