For anyone wondering, Deutschland, Duitsland and Tyskland all have the same latin root “theodiscus” that became “deutsch”. “Allemagne” derives from a germanic tribe, the “Alemanni” who lived in modern day Germany and bordered modern day france. Niemcy and Nemetorszag both stem from old slavic “nem” (or something similar) meaning “mute”. They called the Germanic tribes they interacted with mute because they couldn’t understand them. “Saksa” is derived from the German region “Saxony”.

Please correct me in case i got something wrong.