Block vs Ivory

Block

name

  • An English surname 

  • A Jewish surname 

  • A surname from German 

  • A surname. 

  • A surname from Dutch 

Ivory

name

  • A male given name from English. 

  • A female given name from English. 

  • A surname from Old French. 

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