Hennepin vs Unionville

Hennepin

name
  • A village, the county seat of Putnam County, Illinois, United States. 

  • A surname, notably that of Louis Hennepin. 

  • An unincorporated community in Garvin County, Oklahoma, United States. 

Unionville

name
  • A city, the county seat of Putnam County, Missouri, United States. 

  • A neighbourhood in Markham, Ontario, Canada. 

  • A census-designated place in Pershing County, Nevada, United States. 

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