What a sophisticated, sparkly list of name gems!
Here are my two cents:
The names you should definitely keep…
Aamu - She boasts a gorgeous meaning coupled with a very sweet sound, and reminds me of the peachy color of a sunrise! She is elegant yet adorable, and I can see her on a child or an adult easily! Such whimsy, I love her so much! 
Alice - She is sky blue with cotton clouds, and I adore her understated whimsicality! The Alice in Wonderland association, along with the meaning of “noble,” really make this name for me! 
Cerelia - I am entirely biased as Cerelia is on my own list, but from what I know of you, she seems to be more of a “you” name than Cecelia/Cecilia or Celia. She is very rosy pink and glistening with dewdrops, and has a delicate sort of strength about her!
If I had to rank them from my favorite to least favorite for you, it would be Cerelia, Celia, and finally Cecelia/Cecilia!
Cerelia feels like a relatively unknown classic to me, and would pair splendidly with your other ancient, classic, goddess names, such as Aurora, Diana, and Irina! As a side note, “Celia” could always be a nickname for Cerelia, as it is on my list.
Then you get to keep them both!
Diana - Another ancient classic, and one of the most gorgeous names to ever exist! She is such a pretty amethyst purple to me, and is timelessly beautiful. I would never let her leave your list! 
Faye - Simple and saccharine, in the best way possible, and very airy and pastel. She is ethereal and yet vintage chic all at once, making her another timeless name, usable in any era. And who would not want to be named after the Fae? 
Irina - I just love the way in which her sound flows like a babbling brook, as well as her being derived from Eirene, which is a nod to a goddess just like Aurora, Cerelia and Diana! She is very ballerina-esque, but earthy as well, and reminds me of emerald green. 
Katri - She has such a crisp sound and is so wintry. She is an icy blue, and is such a fun name to say aloud. 
Livia - Another underused and ancient classic, which I believe you mentioned was personal to you. I would never let this name leave your list either if I were you, due to that reason alone. She reminds me of candlelight, and is a pale yellowish cream color.
I much prefer her to Olivia, perhaps attributed to her more spritely sound! The O in Olivia makes it a bit weightier, in my humble opinion. 
Malina - What a downright precious meaning, with such a melodic sound to boot! She is a pretty magenta color, and is easy to say and spell, which is always a bonus. 
Melodia - I am running out of adjectives and compliments for all of these breathtaking choices, so just know that this is one of my favorites for you! She is peach pink, and would be the perfect sister for many a name on your list, but especially Daphne! 
Also, Viveka has this punchiness to it with that fun K that Viveca just cannot hold a candle to. As for your Vio- quandary, I would choose Viola, especially for her Shakespearean cred! 
I apologize for only commenting on which names I think you should keep, but I have a hard time recommending or advocating for removing names from your list, as I do not quite have a firm grasp on your style as of yet. Regardless, I hope my comments were somewhat helpful!
Have a wonderful day!