Cocker vs Sow

Cocker

name
  • A river in Cumbria, England, which joins the Derwent at Cockermouth. 

  • A surname. 

  • A short river in Lancashire, England, which flows into the Lune estuary. 

Sow

name
  • A river in Staffordshire, England, which joins the River Trent. 

  • A surname. 

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