Dutch language
The Dutch of before 1170 is called Old Dutch (Oudnederlands). The Dutch between 1170 and 1500 is called Middle Dutch (Middelnederlands), which is also called Diets and so that is why it is called Dutch in English. The word "Dutch" itself came from the Proto-Germanic word theodiscus, which means "language of the common people" and then was also used to refer to the Germans and their language. Over time, the Modern English usage now refers to that the Netherlands, not the Germans. The Dutch word for German, Duits, comes from the same origin.