Wednesday: [OE] The Romans called the middle day of the week Mercurii diēs ‘Mercury’s day’ (source of French mercredi, Italian mercoledì, and Spanish miercoles). The Germanic peoples equated Mercury with their own god Woden or Odin (whose name may etymologically mean the ‘inspired or mad one’), and they translated the Latin term accordingly, giving Dutch woensdag, Swedish and Danish onsdag, and English Wednesday. [Wednesday etymology, Wednesday origin, 英语词源]