Noel vs X-mas

Noel

name

  • Christmas. 

  • A male given name from French. 

  • A female given name from French. 

  • A city in Missouri. 

  • A surname originating as a patronymic. 

  • A community in Nova Scotia, Canada. 

X-mas

How often have the words Noel and X-mas occurred in a corpus of books? (source: Google Ngram Viewer )