[OJFord]

Well or Londra? The Romans called it Londinium, so you might expect the modern Italian to be ..(I'm no expert on how Italian has modified endings).. 'Londinia' or 'Londino' or something.

It's Londres in French which seems related, I wonder where they came from though.

[Bayart]

Londres is a special case. The /r/ was added in French (and I assume Italian) because London was otherwise clumsy to pronounce.

[stavros]

The Greek word is, in fact, "Λονδίνο" (Londino).