Just met a
Hattie. She is a twin, and I cannot remember her sibling's name for the life of me! It was not nickname-y though, that I can recall.
Anyway, she is about 2 years old.
I like
Hattie, and
LOVE your
Hattie Mabel combo. It's quite like the
Hester Olive combo from another poster on this board. Retro, chic, yet adorably accessible. It just works for me.
As for
Lucy. I do like it. It has the simple, sweet charm of vintage names like
Alice that also feel modern and hipster. I like
Lucy Margaret the best of your list, specifically because of the honoring connection. However,
Lucy Adeline is one of my favorite combos for the name.
Mabel - Pretty. It does have the
Martha,
Opal,
Agnes vibe, but still works. I don't really see it catching on, but then again, I never though
Edith would pop back into the spotlight either.