The name De Chelly is a Spanish corruption of the Navajo word "Tsegi", which means roughly "rock canyon". The Spanish pronunciation "day shay-yee" has gradually changed through English usage, and the name is now pronounced "d'SHAY" (more info at http://www.nature.nps.gov/geology/parks/cach/index.cfm). Ancestral Pueblo peoples are the ancestors of the people living in the 19 modern New Mexico Pueblos and at Hopi in northeastern Arizona.