Oh, I love Irene, and I think it would be very refreshing to hear on a girl. It is a very green name to me, and exceedingly sleek.
Irene Melisande came to mind first.
Irene Beatrix
Irene Bernadette
Irene Blythe
Irene Dorothea (you'd have to pronounce it doro-THAY-uh in this instance)
Irene Gisele / Gisela
Irene Ginevra
Irene Griselda
Irene Guinevere
Irene Jocasta
Irene Lucinda
Irene Magdalene
Irene Marianne
Irene Susanna(h)
Irene Theodora
Irene Theodosia
Irene Victoria
Irene Virginia
Irene Zenobia