Why do the Navajos call themselves dine?

Diné is the Navajo language word for "person" or man". Dine'é is plural, tribe, clan or people.

Navajo language is: Diné bizaad. Navajo land is: Diné bikéyah.
Diné Diyinii means "Holy People" -- Navajo spiritual beings.
Nihookáá' Dine'é --- "the earth surface people", the people on earth.

The i is pronounced like in English "bit". The e is high tone so the word goes low to high. Navajo is a tonal language. The mark is not a stress or accent mark. The e is a short sound like in "met" not drawn out as in "neigh"