She has five kids, including Track and Trig.
I've determined that you can earn respect for any name — no matter how unusual — as long as it's short for something else. That gives it legitimacy. So I was hoping those names were short for Trachadarius and Trigonometry.
Sadly, it looks like they aren't.
This is the New York Times' Maureen Dowd's explanation of the names:
Track (named after high school track meets), Bristol (after Bristol Bay where they did commercial fishing), Willow (after a community in Alaska), Piper (just a cool name) and Trig (Norse for “strength.”)