Ama vs Nanny

Ama

name
  • A female given name 

  • A language of Papua New Guinea. 

  • A Nilo-Saharan language of Sudan. 

Nanny

name
  • A diminutive of the female given names Ann or Anne. 

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