first name vs incognito

first name

noun

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

incognito

noun

  • One unknown or in disguise, or under an assumed character or name. 

  • The assumption of disguise or of a feigned character; the state of being in disguise or not recognized. 

adj

  • Without being known; in an assumed character, or under an assumed title; in disguise. 

adv

  • Without revealing one's identity. 

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