Block vs Rowen

Block

name

  • An English surname 

  • A Jewish surname 

  • A surname from German 

  • A surname. 

  • A surname from Dutch 

Rowen

name

  • A topographic surname from Middle English. 

  • A male given name transferred from the surname. 

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