Mam vs Nanny

Mam

name
  • One’s mother. 

  • A Mayan language spoken in the Mexican state of Chiapas and the Guatemalan departments of Quetzaltenango, Huehuetenango, San Marcos, and Retalhuleu. 

Nanny

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

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