there is no word "deutsch" in the english language. there is a word "german" that refers to a native or an inhabinant of germany, a person of said country's nationality or citizenship. the word you are framing "german" to be already exists, it's "germanic", formed with the root word and a latin suffix "-icus" implying derivation from something (in this case, derivation from an undocumented language that formed a branch of indo-european languages). this is some altaist-tier pseudo-history, where they also ought to blur the line between turk/turkish and turkic.
Slovakia