What about something similar in sound, that has "lee" in it? Like
Ivy Leanne,
Ivy Colleen,
Ivy Aileen,
Ivy Kathleen,
Ivy Rosalie,
Ivy Pauline,
Ivy Jolene?
You could do
Ivy Lee June, that could be cute!
I didn't think of "
Ivy League" until you pointed it out, so it's not really that obvious.