Etymology
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Iroquois 
1660s (adj.); 1670s (n.) "member of the confederated Indian tribes of central New York," from French (c. 1600); not an Iroquoian word, perhaps from an Algonquian language. Related: Iroquoian (1690s). Originally the Mohawks, Oneidas, Onodagas, Cayugas, and Senecas.
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Onondaga 

a people of the Iroquois confederacy, 1680s, named for its principal settlement, from Onondaga onontake, literally "on the hill."

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Oneida 

Iroquois people of upper N.Y. state (they later moved in part to Wisconsin), 1660s, named for their principal settlement, the name of which is from Oneida onenyote', literally "erected stone," containing -neny- "stone" and -ot- "to stand."

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Seneca 
1610s, from Dutch Sennecas, collective name for the Iroquois tribes of what became upper New York, of uncertain origin, perhaps from a Mahican name for the Oneida or their village. Earlier sinnekens, senakees; form probably influenced by the name of the ancient Roman philosopher.
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Kentucky 
U.S. state (admitted 1792), earlier a county of Virginia (organized 1776); the name is of Iroquois or Shawnee origin, perhaps a Wyandot (Iroquoian) word meaning "meadow" (compare Seneca geda'geh "at the field"); the original use in English seems to have been the river name; the native use perhaps was first in reference to a village in what now is Clark County known in Shawnee as Eskippakithiki. Related: Kentuckian.
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Sioux 
group of North American Indian tribes, 1761, from North American French, short for Nadouessioux, sometimes said to be from Ojibway (Algonquian) Natowessiwak (plural), literally "little snakes," from nadowe "Iroquois" (literally "big snakes"). Another explanation traces it to early Ottawa (Algonquian) singular /na:towe:ssi/ (plural /na:towe:ssiwak/) "Sioux," apparently from a verb meaning "to speak a foreign language" [Bright]. In either case, a name given by their neighbors; the people's name for themselves is Dakota.
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