Congrats!
I think finding a longer name for the nickname
Hallie is a great idea.
How about
AthaliahHalynaHanneleHavilahMahala - I love this!
MahaliaNahalAnything catch your eye?
From yours, I like
Halima best and
Halcyone second.
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/