Craven vs Duff

Craven

name
  • A village in the Rural Municipality of Longlaketon No. 219, Saskatchewan, Canada. 

  • A local government district in North Yorkshire, England. 

  • A surname. 

Duff

name
  • A village in Saskatchewan, Canada 

  • An unincorporated community in Tennessee, United States 

  • A male given name 

  • An unincorporated community in Indiana, United States 

  • A surname. 

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