I get the impression you’re not looking for a Spanish name, just something that can be pronounced phonetically in Spanish, correct? Perhaps a name with a Spanish equivalent will work? Plus literary and no a-ending… Let me see:
[name_f]Celeste[/name_f] (it’s pronounced ce-Les-te in Spanish, so not exactly the same, but it works in Spanish, plus [name_m]Babar[/name_m] literature connection)
[name_f]Josephine[/name_f] (she could be [name_f]Josephina[/name_f] to Spanish-speakers, and the [name_m]Little[/name_m] Women connection is great)
[name_f]Belinda[/name_f] (ends with an a, but has a literary connection to [name_m]Ogden[/name_m] Nash’s Custard the Dragon)
[name_f]Diana[/name_f] (lovely bilingual, albeit a-name, and has [name_u]Anne[/name_u] of [name_u]Green[/name_u] Gables connection)
[name_f]Beatriz[/name_f] (Ramona connection, cute nicknames)
[name_f]Ariadne[/name_f] (works in both languages, mythology connection)
I hope that helps!