Hmm - can't say I find any of them compelling. I like
Solveig and
Sunniva, but they are just too far removed from my naming traditions and surroundings for me to ever consider them. And
Soleil is always masculine to me!
When I saw
Sorin, I thought it might be a form of
Søren, which I like but with the same reservations as for
Solveig and
Sunniva.
There was a recording of some kind, long ago, that I heard about from a friend but never heard. The title did stay with me, though: "How
Can You Doubt That The Whole World Is Jewish When
Even The Sun's Name Is
Sol?" Good for a giggle.