William vs Willie

William

name
  • A male given name from the Germanic languages popular since the Norman Conquest. 

  • A surname. 

Willie

name
  • A diminutive of the male given name William 

  • A diminutive of the female given name Wilhelmina or a feminine diminutive of William, often in the form Willie Mae. 

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