Aztec

google

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from French Aztèque or Spanish Azteca, from Nahuatl aztecatl ‘person of Aztlan’, their legendary place of origin.

wiktionary

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From Spanish azteca, from Classical Nahuatl aztēcah, plural of aztēcatl(“inhabitant of Aztlan”).

etymonline

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Aztec

"one of the native people who dominated the central highlands of Mexico in 1519 at the time of the Spanish invasion, 1787, from Spanish Azteca, from Nahuatl aztecatl (plural aztecah), meaning "coming from Aztlan," name of their legendary place of origin, usually said to lie somewhere in what is now southwestern U.S. Related: Aztecan.