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Faye Edgerton retells how the term in Navajo was determined:
“[This term was] easily expressed in the language of Biblical culture, which had kings and noblemen with their brilliant trappings and their position of honor and praise. But leadership among the Navajos is not accompanied by any such titles or distinctions of dress. Those most respected, especially in earlier days, were their headmen, who were the leaders in raids, and the shaman, who was able to serve the people by appealing for them to the gods, or by exorcising evil spirits. Neither of these made any outward show. Neither held his position by political intrigue or heredity. If the headman failed consistently in raids, he was superceded by a better warrior. If the shaman failed many times in his healing ceremonies, it was considered that he was making mistakes in the chants, or had lost favor with the gods, and another was sought. The term Navajos use for headman is derived from a verb meaning ‘to move the head from side to side as in making an oration.’ The headman must be a good orator, able to move the people to go to war, or to follow him in any important decision. This word is naat’áanii which now means ‘one who rules or bosses.’ It is employed now for a foreman or boss of any kind of labor, as well as for the chairman of the tribal council. So in order to show that the king is not just a common boss but the highest ruler, the word ‘aláahgo, which expresses the superlative degree, was put before naat’áanii, and so ‘aláahgo naat’áanii ‘anyone-more-than-being around-he-moves-his-head-the-one-who’ means ‘the highest ruler.’ Naat’áanii was used for governor as the context usually shows that the person was a ruler of a country or associated with kings.”
(Source: Faye Edgerton in The Bible Translator 1962, p. 25ff.)