What is Jake Peralta's full first name?

Jake Peralta's full first name is Jacob. The character is formally identified as Jacob “Jake” Jeffrey Peralta, although nearly everyone in the Nine-Nine uses his nickname.

Andy Samberg plays Jake, the series' central detective. He is introduced as an exceptionally talented investigator whose immaturity, jokes, and obsession with films—especially Die Hard—often clash with Captain Raymond Holt's disciplined leadership style. Over the series, Jake grows into a more responsible detective, colleague, husband, and father.

The name Jacob appears in character descriptions and is also consistent with Jake's established identity in the show. “Jake” is a conventional short form of Jacob, so the question is asking for his given name rather than his middle or family name. His full name is Jacob Jeffrey Peralta.

A neighbouring detail fans often ask about is Jake's relationship with Amy Santiago. They eventually marry in season five and have a son, Mac, whose name references Jake's beloved Die Hard hero, John McClane.