Germ vs Wend

Germ

noun
  • a German person. 

Wend

noun
  • A Slavic person living anywhere in the vicinity of German-speaking areas. 

  • A member of a Slavic people from the borders of Germany and Poland; a Sorb; a Kashub. 

How often have the words Germ and Wend occurred in a corpus of books? (source: Google Ngram Viewer )