Libby vs Pioche

Libby

name
  • A city, the county seat of Lincoln County, Montana, United States. 

  • A diminutive of the female given name Elizabeth and Isabel. 

  • A surname originating as a matronymic. 

Pioche

name
  • An unincorporated town, the county seat of Lincoln County, Nevada, United States. 

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