Abbey vs Abby

Abbey

name
  • A diminutive of the male given name Albert, from the Germanic languages. 

  • The precincts of the Abbey of Holyrood. 

  • A British surname. 

  • A diminutive of the female given name Abigail, from Hebrew. 

  • Westminster Abbey. 

Abby

name
  • A diminutive of the male given name Albert, from the Germanic languages 

  • A diminutive of the female given name Abigail, from Hebrew, also used as a formal given name. 

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