Frank vs Roger

Frank

name

  • A male given name from the Germanic languages. 

  • A diminutive of the male given name Francis 

  • A surname transferred from the nickname. 

noun

  • One of the Franks, a Germanic federation that inhabited parts of what are now France, the Low Countries and Germany. 

Roger

name

  • A male given name from the Germanic languages. 

  • A surname originating as a patronymic. 

  • Jolly Roger (pirate flag) 

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