American French, short for Nadouessioux, from Ojibwa na·towe·ssiw-
1703, in the meaning defined at sense 1
Siouan
Sioux
Sioux City
“Sioux.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Sioux. Accessed 1 Dec. 2024.
Britannica.com: Encyclopedia article about Sioux
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