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* As an English surname, from the medieval pronunciation of the name Walter. * As an English and German surname, from the noun water. * As an Irish surname, adopted as a translation from Ó Fuartháin (see Foran), mistaken for Ó Fuaruisce (“descendant of cold water”), from fuar + uisce.

Etymology tree Proto-Indo-European *wed- Proto-Indo-European *-r̥ Proto-Indo-European *wódr̥ Proto-Germanic *watōr Proto-West Germanic *watar Old English wæter Middle English water English water From Middle English water, from Old English wæter (“water”), from Proto-West Germanic *watar, from Proto-Germanic *watōr (“water”), from Proto-Indo-European *wódr̥ (“water”). Cognates * Scots watter (“water”) * Yola wadher, waudher (“water”) * North Frisian waar, weeder, weeter, woar, woor, wååder, wåår (“water”) * Saterland Frisian Woater (“water”) * West Frisian wetter (“water”) * Cimbrian bassar, bazzar (“water”) * Dutch water (“water”) * Afrikaans water (“water”) * Dutch Low Saxon water, wotter (“water”) * German Wasser (“water”) * German Low German Water, Woter (“water”) * Gottscheerish boßər, bàsser (“water”) * Limburgish Waater, water (“water”) * Luxembourgish Waasser (“water”) * Mòcheno bòsser (“water”) * Vilamovian woser (“water”) * West Flemish woater (“water”) * Yiddish וואַסער (vaser, “water”) * Danish vand (“water”) * Elfdalian wattn (“water”) * Faroese vatn (“water”) * Icelandic vatn (“water”) * Norwegian Nynorsk vatn (“water”) * Norwegian Bokmål vann (“water”) * Swedish vatten (“water”) * Gothic 𐍅𐌰𐍄𐍉 (watō, “water”) * Old Irish coin fodorne (“otters”, literally “water-dogs”) * Latin unda (“wave”) * Lithuanian vanduõ (“water”) * Polish woda (“water”) * Russian вода́ (vodá, “water”) * Albanian ujë (“water”) * Ancient Greek ὕδωρ (húdōr, “water”) * Armenian գետ (get, “river”) * Sanskrit उदन् (udán, “wave, water”) * Hittite 𒉿𒀀𒋻 (wa-a-tar, “water”)

From Middle English wateren, from Old English wæterian, from Proto-Germanic *watrōną, *watrijaną, from Proto-Germanic *watōr (“water”), from Proto-Indo-European *wódr̥ (“water”). Cognates Cognate with Scots watter (“water”), Saterland Frisian woaterje (“to water”), West Frisian wetterje (“to water”), Dutch wateren (“to water”), German Low German watern (“to water”), German wässern (“to water”), Danish vande (“to water”), Swedish vattna (“to water”), Icelandic vatna (“to water”).