Where does “Eau Claire” come from?

Eau Claire (French) comes from French EAU, from Middle French eau, from Old French ewe, from Latin aqua, from Proto-Italic akʷā, from Proto-Indo-European h₂ekʷeh₂ — water, flowing water.

Ancestry of “Eau Claire”, step by step

Eau Claire traces back through two separate lines of ancestry.

via French EAU

StepLanguageWordMeaning
1FrenchEAUwater, a liquid that is transparent, colorless, odorless and tasteless in its pure form, the primary constituent of lakes, rivers, seas and oceans
2Middle Frencheauwater
3Old Frenchewewater
4Latinaquawater
5Proto-Italicakʷāwater
6Proto-Indo-Europeanh₂ekʷeh₂water, flowing water

via French Claire

StepLanguageWordMeaning
1FrenchClaire
2Latinclarainflection of clārus: ## nominative/vocative...
3Latinclarusclear, bright; renowned, famous; upstanding,...
4Proto-Italicklāzos
5Proto-Indo-Europeankelh₁-to call, cry, summon
Every word from Proto-Indo-European h₂ekʷeh₂Every word from Proto-Italic akʷāEvery word from Latin aqua