I like
Blythe; it makes a good middle name for a lot of things.
Aurelia Blythe is very nice!
Annabel Blythe wouldn't be too B-heavy, but with both the B and the L repeated, it lacks some flow.
Katherine Blythe won't do - it's lispy because of the two th's. Perhaps
Katerina Blythe?
- chazda