Chew vs Tone

Chew

name

  • A river in Somerset, England 

  • A surname. 

Tone

name

  • A river in Somerset, England, which flows into the River Parrett. 

  • A male given name, a short form of Anthony/Antony 

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