I love Apollonia! In Catalan, it's Apol·lònia, which I think is AMAZING! You can hear that version here: http://www.forvo.com/word/apol%C2%B7l%C3%B2nia/#ca
Thing is, as much as I love it, I don't really know what to do with it.
Love, Love, LOVE Apollonia! I go back and forth between this spelling and the Slovak Apolena (though this one is said slightly different). While it is of Greek origin, it has a history in Italy as well (in my family, mainly Sicily and in the Belluno region of Northern Italy -- though in my family appears more frequently as the male form, Apollonio). Apollonia is the patron saint of my great-grandmother's town in Belluno. Also, in Latin, Polonia is the word for Poland, so I also like it because it works to connect both of my parents heritage.
My preferred nickname is Polly, but I could see Nia or Nina (as well as Apple).
Ideas That I have had:
Apollonia Eva (also Eva Apollonia)
Apollonia Evangeline (very long though)
Yes! Purple Rain was exactly what I tought of too. Sorry, but I can't imagine it as a real name in the US as a consequence
I never thought of the purple Rain association before!