Fun Fact for fantasy fans: In Tolkiens "The Lord of the Rings" the kingdom of Rohan is divided into a Westfold and an Eastfold. It's basically the same as Westfalen (Westphalia). In former times there was an Ostfalen (Eastphalia?), too, but this name isn't used any more. Tolkien used the old Saxons as a model for the Rohirrim, and there language, including the names of these areas.