Lucia is really pretty but I think Charlotte is a little off with it, TBH. Just my opinion. Getting from the ch sound to the sh sound is just a but awkward to me.
Have you thought of something like Raphaella as a middle? Lucia Raphaella is super feminissima and lush and gorgeous. If I were Italian at all I'd totally go for it.
I also like Aria. Marcella is pretty too. And Domenica is incredible. For Lucia I like the nn Lux but I know it's not for everyone.
Suggestions for middles:
Congratulations and best wishes!
Emily, I love the name so much but I think it's so overused. It is a beautiful name though.
Lucia Charlotte, I never thought about that. And thank you for saying that about Domenica, it was my great grandmther's name. I would most likely use opit as a middle name to honor her. Lucia Emmeline, Lucia Violet, Domenica Lucia, Domenica Charlotte, Marcella Ruby, and Aria Sloane I am in love with. Aria Sloane is my favorite actually! Thank you sooo much, you were such a big help in narrowing down my list!!
Sloane's really interesting, but its got a certain feel about it that if you had a little sibling for Aria Sloane, you'd want to make sure their name would compliment it well, and Sloane is kind of tricky. Names that kind of give me the same vibe as Sloane are Harper, Sawyer, Sullivan, Piper, and even Spencer.
Family ties and culture to names are really great, and I think they're important to use them, especially when you like them. Unfortunately, a name like Sloane would be hard to put next to a Domenica in the future. That isn't to say that I don't like Aria Sloane, or the feel to it; it's cool, hip, and fresh, and I'm all about that. There's just this other side to me that loves old names like Raphaela and it's ties to the past.
Lucia and Aria go really well together, so if you use one over the other, don't forget about the other! (The cool thing about Lucia, is that it's easily translatable to Luca for a boy.)