What is "medjay"

The Medjay (also Medjai, Mazoi, Madjai, Mejay, Egyptian mDA.y)–from mDA, represents the name Ancient Egyptians gave to a region in northern Sudan–which an ancient people of Nubia inhabited. In the New Kingdom, the word Medjay developed to refer to members of the Ancient Egyptian military as desert scouts and protectors of areas of pharaonic interest. However, this evolution is more likely based on a change in the definition of the word, Medjay, rather than a change in the Eastern Desert peoples.