Empress vs Ridge

Empress

name
  • A village in Alberta, Canada. 

Ridge

name
  • A village in Hertsmere district, Hertfordshire, England, United Kingdom. 

  • A male given name transferred from the surname. 

  • A toponymic surname from Middle English, named after the natural feature. 

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