Good call, I think it would be better used as a nn too. It's alright but nms.
Mildred nn Miley
Emmeline nn Miley
Milena nn Miley
Miloslava or
Mila nn Miley
Camila nn Miley
Maile - pro. my-leh nn Miley
Magdalen nn Miley
Maiara nn Miley?
What do you think of those? I know they don't all have the "
MY" sound, so some might be far fetched. But they might work.