Ebony vs Raven

Ebony

name

  • A female given name from English. 

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 Ebony and Raven occurred in a corpus of books? (source: Google Ngram Viewer )