https://sites.lsa.umich.edu/davidfrye/wp-content/uploads/sites/281/2015/07/guaman.pdf
This land was in the highest altitude, thus they called it Indies. This means land in the day; this is why they gave it the name Land In Day, In Dies, not because the natives were called Indians: from Indies they got Indians. This same land is higher than all Castile and the other lands of the world. The first word was New World -- this is the title and true name that it has -- and they are called Natives. And thus the new-come Spaniards call them Indians, even now they call them so, and they err. Just as the Spaniards are all in common called Spaniards -- wira cocha --, so the Indians: each group has its names: Castile, Rome.