Comanche

wiktionary

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Probably from Spanish comanche, a corruption of Old Ute kɨmantsi *[kɨˈman.tʃi] (“enemy”, “foreigner”) (compare Modern Southern Ute [kɨˈmaːtʃi̥] (“enemy”, “stranger”)). The Comanches’ autonym is Nʉmʉnʉʉ(“the people”).

etymonline

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Comanche (n.)

Native-American people from the southwestern Great Plains, 1819, from Spanish, from a word in a Shoshonean language, such as Ute kimánci "enemy, foreigner." Their territory was Comancheria. Comanchero was a 19c. name given to Hispanic and American traders who dealt with the Comanches.