Jazz vs Rob

Jazz

name
  • A diminutive of the male given name James. 

  • A diminutive of the female given name Jasmine. 

Rob

name
  • A diminutive of the male given name Robert. 

  • A surname transferred from the given name, derived from Robert. 

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