出典:Wiktionary
From Proto-Germanic *īwaz, from Proto-Indo-European *h₁eyH-weh₂-, a suffixed form of the base *h₁eyH- (“reddish, colourful”).
Cognate with Old High German īwa (German Eibe), Middle Low German īwe, Dutch ijf, Old Norse ýr (“bow, yew”). The Indo-European root is perhaps also the source of Old Irish ibar (Irish iúr), Proto-Balto-Slavic *eiwas (Lithuanian ievà), Proto-Slavic *jьva (Russian и́ва (íva, “willow”)), Latin ūva (“bunch of grapes”)).
The West Germanic languages have a variant *īhwaz with a guttural consonant, represented by 古期英語 ēoh.