I've been wondering why Germany is called Německo in Czech. While reading about Proto-Slavic, I found the answer.
as opposed to the Slavic word for foreign nations, němci, meaning "mumbling, murmuring people" (from Slavic němъ - mumbling, mute).[10] For example, the Polish word Niemcy means "Germans" or "Germany" (as do its cognates in many other Slavic languages).
"MURMURING, MUMBLING PEOPLE"
HAHAHHAHAHAHAHAHAHAHHA
"CANT UNDERSTAND YEW"
"What shall we call these foreigners?"
"Gibberish incarnate."
Oh, that's rich.