Birdie vs Caca

Birdie

name

  • A female given name from English. 

  • An effective or child's term for any (small) bird. (1999: Oxford Dictionary of Slang, p. 130) 

Caca

name

  • goddess of the hearth. 

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