Nigger vs Raven

Nigger

name
  • A given name for a black pet. 

  • Niger (country). 

Raven

name
  • A female given name from English for a girl with raven hair, used since the 1970s. 

  • A male given name 

  • A surname. 

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