Barb vs Fanny

Barb

name

  • A diminutive of the female given name Barbara. 

  • A surname. 

noun

  • A fan of the American singer Nicki Minaj, especially a female one. 

Fanny

name

  • A diminutive of Frances, also used as a female given name. 

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