Nanna vs Old Man

Nanna

name
  • The god of the moon in Sumerian mythology. 

  • A surname from Italian. 

  • A goddess, the wife of Balder. 

Old Man

name
  • A creator god in some Native American mythologies. 

  • A title given to the personification of a force of nature or abstract concept, such as Old Man Winter or Old Man River. 

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