Grenich anyone?
In my country, it was always pronounced as green-each. Only in this thread I realised it's written Green-wich and pronounced gren-each.
And I'm pretty sure I'll forget it quickly and just keep calling it green-each.
However, some Americans even have trouble with Glasgow (Glaz-go, not Glass-gow) and Edinburgh (Ed-in-burra, not Edin-bro)
I've heard some Americans pronounce it "Edin-bo-ro" which is entirely off.