londres

Inherited from Middle French Londres, from Old French Londres, ultimately from Latin Londinium. However, it is not a natural evolution from Latin to French, as Londinium would render *Londin, *Londein. Thus, it is possible that it was borrowed or at least derived from Old English Lunden. The final syllable would have been weakened to -dn, later changing to -dr, which would yield an epenthetic -e. The -s would be added to fit Old French declension.