Missing info from: Season 4
Aliases play an important role in Person of Interest.
Main article: Harold Finch/Aliases
While his true family name is unknown, it was revealed in “Lethe” that Finch's real first name is Harold. He frequently uses the common name of a bird species as his surname. His earliest records ((“Wolf and Cub”)) list him as Harold Wren, which is also the name known to his best friend Nathan Ingram. Reese, Fusco, Carter, Alicia Corwin, Leon Tao, and Sameen Shaw know him as Harold Finch. Harold's fiancee Grace Hendricks knows him as Harold Martin.
- Harold Finch
- Harold Wren
- Norman Burdett (Sounds like "bird-ett"; or possible anagram for the bird Red Butt)
- Mr. Partridge
- Harold Crane
- Harold Crow
- Harold Swift
- Harold Gull
- Harold Quail
- Harold Starling
- Mr. Kingfisher
- Harold Martin
- Harold Whistler (May be a reference to bird calls. May also refer to the hunter's nickname for the Common Goldeneye, a duck found across North America. May also refer to Hugh Whistler, English ornithologist)
- Mr. Egret
- Harold Cardinal
- Harold Osprey
Main article: John Reese/Aliases Though Reese's real last name is unknown (only the last letter, "s", is shown when Carter reads his file in “Many Happy Returns”), his military records suggest his real first name is John. "John Reese" is an alias given to him by Kara Stanton in “Foe”. Finch, Carter, Fusco, Darren McGrady, Mark Snow, Alistair Wesley, and Sameen Shaw know him as John Reese.
Main article: Sameen Shaw/Aliases
Shaw's real first name is Sameen.
Main article: Root/Aliases
Root's real name is Samantha Groves. She's been using the alias Root since 1991. (“Bad Code”)
Several other characters are at this point only known under their aliases.
- Kara Stanton
- Mark Snow
- John Greer
- Special Counsel
- Tyrell Evans
- Harper Rose
- Martine Rousseau
- Jeremy Lambert
Some characters were introduced in the show under an alias, and their real name was revealed later.
- Charlie Burton, real name: Elias (“Witness”)
- Scarface, real name Anthony Marconi (“Witness”) (“All In”) (Note that the character has only been once referred to as Scarface on screen, by Reese. Elias referred to him as Anthony. (“The Devil You Know”))
- Ulrich Kohl, alias: Wallace Negel (“Foe”)
- Ernie Trask, real name: Ernesto Machado (“Super”)
- Sarah Atkins, Karen Garner, real name: Sarah Jennings (“Many Happy Returns”)
- Graham Wyler, real name Lloyd Pruitt (“The High Road”)
- Mira Dobrica's real name is Mira Brozi (“Booked Solid”)
- Peter Collier, real name Peter Brandt (“Nothing to Hide”) (“A House Divided”)
- Mike Laskey, real name Mikhail S. Lesnichy
- Link, real name Lincoln Cordell (“Panopticon”)
Aliases that were made up on the go:
- Zoe referred to Reese as "Savannah the exotic dancer" in “The High Road”
- Leon Tao used the alias "Jason Bao" in “All In”