Con vs Tad

Con

name

  • A male given name, a diminutive form of Conor or Cornelius. 

  • A female given name, a diminutive form of Connie. 

Tad

name

  • A diminutive of the male given name Thaddeus or Thaddaeus. 

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