I like Cora & Lilah - on their own and also as sisters to Evi3 and H@zel.
I don’t warm to Ayla - I find it really harsh sounding - and I also don’t think it’s especially easy to say with Lily as a middle.
To compromise, you might Cora-Lily (ie double first name), Lila/Lilah (if you’re OK with the nn Lil or Lily sometimes), Leah, Lilia, Lilith, Lily-Anne/Liliane (prefer Liliane to Lillian in terms of pronunciation), or Lily-Rose (I find Lily-Rose so pretty!). What about Lilou (“Lee-Loo”) the French diminutive for Lily? Means you can call her Lee, Lily or Lou for short!
Otherwise, is it time to start the list afresh?