byname vs family name

byname

noun
  • A pseudonym; nom-de-plume. 

  • A ritual title for a god or goddess used in Heathenry. 

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 byname and family name occurred in a corpus of books? (source: Google Ngram Viewer )