Nanny vs Pat

Nanny

name

  • A diminutive of the female given names Ann or Anne. 

Pat

name

  • A diminutive of the female given name Patricia. 

  • A diminutive of the male given name Patrick. 

  • A surname. 

noun

  • An Irish person. 

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