Carrigan -- I'm not a fan. Sounds too much like a Cardigan sweater.
Madigan -- This reminds me of Mad Mardigan from Willow.. I would surely prefer Madeline, but that's way too popular for your taste.
Everley -- Very pretty, but I think I prefer a plain and simple Ever. I think Ever is sweet, beautiful, and meaningful. Adding the "ley" on the end makes it sound trendy, and like a lot of other popular names.
Ashby -- I don't really like any Ash names (Ashton, Asher, etc). Not really sure why though.
Gracen/Gracyn - I like it. I'd probably spell it
Graecen, or something similar. I like the "Grae" part.
Emery -- I like it a lot. This is my favorite from your list (just Ever beats Emery though).
Some suggestions:
Scarlett
Mercy
Mina (Mee-nuh)
Landry
Elodie
Amalia
Waverly
Ellery
Mallory
Melody