Siv

Minor, but this is the name of the mother (a spotted owl) of the eponymous Hoole in the children's book series Guardians of Ga'hoole. It was the first time I'd heard the name myself, I had no idea it was connected to Norse Mythology.

Siv Widerberg, a Swedish poet bears this name. Some of her poems were my favourites as a child, therefore I'll always have a positive feeling about this name.