To me,
Noam is so obscure, that I don't find it too strongly associated with either gender. So I think it could work on a girl.
Of your list I l don't mind:
Noam AlenaNoam XavieraNoam Ellen
Some other ideas:
Noam Alessandra (I think if I was a girl named
Noam I would like a pretty decidedly feminine middle name)
Noam AmeliaNoam ElissaNoam EloiseNoam ChristianeNoam JulietNoam VivianNoam Aaliyah
Three boys nappin', one mama namenerdin'
To peruse my top 100ish names:
http://www.behindthename.com/pnl/82589
He is becoming greater, I am becoming less
Bits of the journey here:
http://jodifriesen.blogspot.ca/And some family cuteness here:
https://www.flickr.com/photos/41705228@N08/