first name vs nickname

first name

noun

  • The first element of a full name in cultures that place the given name first. 

nickname

noun

  • A familiar, invented name for a person or thing used instead of the actual name of the person or thing, often based on some noteworthy characteristic. 

  • A familiar, shortened or diminutive name for a person or thing. 

verb

  • To give a nickname to (a person or thing). 

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