Mac vs old fellow

Mac

noun

  • Used to address a man whose name is unknown. 

  • A Macintosh computer (made by Apple Inc.). 

prefix

  • son of. 

name

  • McMaster University 

  • A diminutive for a person with a surname that starts with "Mac" or "Mc". 

  • A diminutive of the male given name Max. 

old fellow

noun

  • Synonym of old chap (“the penis”) 

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