Etymology
From Middle English Wednesday, from unattested Old English *wēdnesdæġ (“Wednesday”), synchronically an i-mutated form of attested wōdnesdæġ (itself from Proto-West Germanic *Wōdanas dag, its reflex Middle English Wodnesdei falling into disuse), from Proto-West Germanic *Wōdinas dag also attested in Old Frisian wednesdei and Middle Dutch wenesdach. In any case, a calque (interpretātiō germānica) of Latin diēs Mercuriī (“day of Mercury”) and Koine Ancient Greek ἡμέρα (hēméra, “day”) Ἑρμοῦ (Hermoû, “of Hermes”), via an association of the god Odin (“Woden”) with Mercury and Hermes. See also Japanese 水曜日 (“Mercury's day”).
Cognates
Cognate with Scots Wadensday (“Wednesday”), Yola Wennesdei (“Wednesday”), West Frisian woansdei (“Wednesday”), Afrikaans Woensdag (“Wednesday”), Central Franconian J