"German"

About five minutes ago I figured out why Germans are called Germans in English, thanks to a fun little game called MooT. 

In German, the people are called Deutsche and the country, logically, is called Deutschland, land of the Germans. So where do we get off calling them Germans?

German derives from Latin germanus, meaning "closely related". Also the source of the word germane, meaning "that which is relevant to the current subject." Another similar Latin word is the proper noun Germanus, which is where the Romans got off calling those barbarians to the north Germans, because, as a tribe, they were very closely related.

Cheers.