designation vs last name

designation

noun
  • That which designates; a distinguishing mark or name; distinctive title; appellation. 

  • Selection and appointment for a purpose or office; allotment; direction. 

  • signification, meaning, for example of a word or phrase. 

  • An act or instance of designating; a pointing out or showing; indication. 

last name

noun
  • One's family name; surname. 

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