Duke vs Ken

Duke

name
  • A male nickname 

  • The American actor John Wayne. 

  • A male given name from English; mostly US and rather rare. 

  • The title of a duke. 

  • A surname originating as an occupation for service in the household of a duke, or from a nickname. 

Ken

name
  • A diminutive of the male given name Kenneth. 

  • Kensington in London (in combinations, e.g. South Ken, High Street Ken). 

  • A surname. 

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