I like Ember. The only thing is that it might be confused with
Amber, which I don't care for all that much.
Ezra and Ember are close, but I think you could still use both names in the same sibset.
Out of your combos, I like Ember
Faye the best. I love
Ivy and also like
Meadow and
Rain, but I wouldn't pair two nature names together.
Ember
Ottilia has a nice flow.