Eartha vs guano

Eartha

name
  • A female given name originating as a coinage. 

guano

noun
  • Coccothrinax borhidiana, a variety of palm tree indigenous to Cuba. 

  • Dung from a sea bird or from a bat. 

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