jo vs joe

jo

noun
  • Darling, sweetheart. 

  • The staff used in the Japanese martial art of jodo or jojutsu. 

joe

noun
  • A male; a guy; a fellow. 

  • Synonym of johannes (“An old Portuguese gold coin bearing a figure of John V of Portugal.”) 

  • Coffee. 

  • A spy, especially a double agent. 

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