family name vs nomen

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. 

nomen

noun
  • The name of a citizen of Ancient Rome, designating them as a member of a gens. 

  • The birth name of a pharaoh, the fifth of the five names of the royal titulary, traditionally encircled by a cartouche and preceded by the title zꜣ-rꜥ. 

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