first name vs moniker

first name

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

moniker

noun
  • A personal name or nickname; an informal label, often drawing attention to a particular attribute. 

  • A person's signature. 

  • An object (structured item of data) used to associate the name of an object with its location. 

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