I like "agorism" because it opens a conversation about the agora and free markets in contrast to planned or manipulated economies. "Voluntaryism" is an awkwardly long word people tend to think just means "volunteering," but it does convey the idea of voluntary exchange and voluntary association as a fundamental principle. Of course, "anarchist" just means violence and disorder to most, and the media reinforces this stereotype at every opportunity in their capacity as apologists for the State. "Autarchism" and "panarchy" also have potential.