Does ‘Sioux’ really mean ‘snake’?

I heard recently that the “Sioux” call themselves Lakota and “sioux” means “snake” in their enemies’ language. No, according to Wikipedia, that’s just a rumor. However, Sioux is a shortened form of Nadoüessioüak an Odawa* word for speaker of a foreign language. The Sioux were an alliance of several tribes speaking related languages such as Lakota and Dakota (both of which, apparently, mean “ally”) and Mandan.

*Hence, Ottawa.

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