Manual vs Tone

Manual

name
  • A male given name from Spanish: a rare spelling variant of Manuel, sometimes considered erroneous. 

Tone

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

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

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