I love them all with the exception of
Astrid which I want to like but I can't get past the 'ass' beginning.
Re: alliteration, I love it --especially h alliteration! I'm not kidding.
My dd used to have a friend named
Hilary H. and I loved her name. ;-) It's quite memorable. It reminds me of actress,
Helen Hunt. I love her name also.
Susanna Hill sounds lovely as does
Eva Hill.
Astrid Hill just doesn't flow as well, imo, as the other three options.