It's a tie between
Liana and
Lydia, for me.
Liana is prettier and softer, but
Lydia has that great classic charm to it. Both are lovely, in any case.
Liana make me think of green vines and pink flowers, and
Lydia makes me think of rustic stone cottages and rolling green meadows.
I don't really like
Leah, and
Liliana is nice too but sounds a little too much like Lily-anna and not like its own separate name.