Misr

Misr: The historical Zensunni (Fremen) term for themselves: "The People". Apparently the Misr Sunni ancestors fled from Nilotic al-Ourouba to become the Fremen and or Zensunni.

Behind the scenes
Miṣr is the Arabic and modern official name of Egypt. The word comes from the Hebrew מִצְרַיִם‎ (Mitzráyim) and originally connoted "metropolis" or "civilization" and means "country", or "frontier-land".