Abby vs Abi

Abby

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

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

Abi

name
  • A diminutive of the female given name Abigail. 

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