anonym vs family name

anonym

noun
  • A mere name; a name resting upon no diagnosis or other recognized basis. 

  • An anonymous person. 

  • An assumed or false name; a pseudonym. 

family name

noun
  • A given name common in a family, or already borne by someone in the family (in the context of naming someone in the family after that family member). 

  • A surname. 

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