family name vs term of endearment

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. 

term of endearment

noun
  • A word, phrase, or nickname used as a term of address expressing affection. 

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