Refers to the fairy-tale character Snow White. Used in the title of the story and to refer to the character herself.
"Snow White" is one of Grimm's Fairy Tales.
Snow White lived with the seven dwarfs.
From 白雪 (しらゆき, 'white snow') + 姫 (ひめ, 'princess'). The name is a direct translation of the German 'Schneewittchen' (Snow White).