Peter vs Tad

Peter

name

  • A male given name from Ancient Greek. 

  • The leading Apostle in the New Testament. 

  • A surname originating as a patronymic. 

  • The epistles of Peter in the New Testament of the Bible, 1 Peter and 2 Peter attributed to St. Peter. 

Tad

name

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

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