E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
when it was Saxon, was called Eorwic, and the legend is that a Duke of Effroc being drowned at the foot of the wall caused this name to be given to the city. Southwark Wall was also called the Effroc Wall or Stone. (Victor Hugo: LHomme qui Rit, pt. ii. bk. iii. 1.)
York is Eure-wic (pron. Yorric), and means the town on the Eure, now called the Ouse. The Romans Latinised the word Eure or Eure into Evora or Ebora, and wic into vicum; whence Ebora-vicum, contracted into Eboracum.