Most of these are pretty uncommon. One of my favorites, Evelyn (which I decided on for a second daughter years ago), has sadly been climbing the charts in popularity. It was #24 in the US last year (although, if you consult the effective rank list at NameNerds.com which tabulates variations on names, it drops down to #43). I have kept a nervous eye on it.
Evelyn
Marilyn
Bridget
Caroline
Meredith
Clarice
Helena
Oriel (technically, this name is unisex in Hebrew, but I think it sounds feminine)
Merida (yes, from the Pixar film!)
Mercy
Eden
Selina
Ivy
Miriam
Mirabel
Marlys
Adelaide
Seraphine
Saffron
Sierra
Lydia
Adele
Anya
Ada
Vivienne
Cassandra
Aurora
Cecily
Winifred
Constance
Harmony
Zina (pronounced with a long "I" as in the word "eye," not zeena)
There are plenty of unisex names that I like on girls, but there's my feminine list. I tend to avoid popular names like the plague.
EDIT: I just checked and all of those names are safely out of the top 100 in the United States except Evelyn.