What is "avoyel"

The Avoyel or Avoyelles was a small Natchez-speaking tribe who inhabited land near the mouth of the Red River at its confluence with the Atchafalaya River, in the area of present-day Marksville, Louisiana. The indigenous name for this tribe is Tamoucougoula. The word Avoyel is of French derivation and means either "Flint People" or "the people of the rocks."