My daughter's name is
Sunniva, and i think it's totally usable in the US. i think it's #45 or so in Norway, but very uncommon here.
However, i live in a quaint little Norwegian town in the midwest, so i am finding several, "i had an aunt/grandma/best friend named Sunniva"'s, etc.
My friend just named her baby
Bjorn, which i thought was a stretch, but i am liking it more and more and think it will work fine in the US.
i would so much rather a
Sunniva or
Bjorn than a
Mackenzie, so i would celebrate any Norwegian name you chose!