Andrew Sullivan blogs "Willow" was Buffy the Vampire Slayer's best friend and "Piper" was the the second sister on the series Charmed.... Willow and Piper are both witches. Good witches.
Well at least they were good witches. Maybe this is an indication that Palin respects other religions, like Wicca. But understand, these are not real witches, Those are TV shows. I.E. not real. Besides in People Todd explains where they got the names
Sarah's parents were coaches and the whole family was involved in track and I was an athlete in high school, so with our first-born, I was, like, 'Track!' Bristol is named after Bristol Bay. That's where I grew up, that's where we commercial fish. Willow is a community there in Alaska. And then Piper, you know, there's just not too many Pipers out there and it's a cool name. And Trig is a Norse name for "strength."