What is the first name of Jake and Amy's son?

Jake and Amy’s son is named McClane, usually called Mac, in Brooklyn Nine-Nine. His full name is McClane “Mac” Peralta-Santiago, and he is born during the season-seven finale, “Lights Out.”

The name is a reference to John McClane, the fictional hero played by Bruce Willis in the Die Hard films. Jake is a devoted Die Hard fan, so the choice fits one of his longest-running obsessions. The episode also turns the birth into a precinct-wide emergency when a Brooklyn blackout begins as Amy goes into labor.

Mac’s birth takes place at the precinct before the family reaches the hospital. This detail is sometimes confused with Nikolaj, who is Charles Boyle’s adopted son from Latvia, or with names belonging to other characters’ children. Mac’s arrival becomes an important turning point for Jake: in the final episode, Jake leaves the NYPD so he can spend more time raising his son.