Ma vs Nana

Ma

name
  • A common surname from Chinese of East Asian derivation. 

  • A language spoken in the Democratic Republic of the Congo. 

Nana

name
  • A Japanese female given name from Japanese 

  • One's grandmother. 

  • A governess. 

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