Rich vs Rick

Rich

name

  • A diminutive of the male given name Richard. 

  • A surname transferred from the given name. 

Rick

name

  • A diminutive of the male given name Richard, or sometimes of related names, such as Ricardo. 

  • A surname transferred from the given name. 

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