Boo vs Yay

Boo

name
  • The Boko language. 

  • A community in Nacka, Stockholm, central Sweden. 

Yay

name
  • A branch of the Tai language family, spoken by the Bouyei and Giáy people. 

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