Clay vs Louisville

Clay

name
  • A number of townships in the United States, listed under Clay Township. 

  • A surname originating as an occupation. 

  • A census-designated place in Sacramento County, California, United States. 

  • A town, the county seat of Clay County, West Virginia, United States. 

  • A male given name transferred from the surname. 

  • A diminutive of the male given name Clayton. 

Louisville

name
  • A village, the county seat of Clay County, Illinois. 

  • A city, the county seat of Jefferson County, Georgia, United States. 

  • A city, the county seat of Jefferson County, Kentucky. 

  • A city, the county seat of Winston County, Mississippi. 

  • A town in Barbour County, Alabama. 

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