Question: What is the name of the girl played by Linda Blair in the Exorcist?

Context paragraphs:
Cold Blooded (song): "Cold Blooded" is a funk song written and recorded by Rick James in 1983.  James wrote the song about his relationship with actress Linda Blair.  While hanging out in James's home recording studio, Blair was interested in learning how to write music.  James fired up his synthesizer and absentmindedly began noodling with the keys and came up with "Cold Blooded"'s cold bass line.  Running with the idea, he played all the instruments on the track.  Synth-based, it was a departure from James's previous guitar-based, horns-laced sides.  He utilized the Roland TR series of drum machines which were dominant on the '80s-era Jimmy Jam-and-Terry Lewis-produced hits of The S.O.S. Band.  Released as a single from the album of the same name, it spent six weeks at number one on the Billboard R&B Singles chart and reached number forty on the Hot 100.

Exorcist II: The Heretic: Exorcist II: The Heretic is a 1977 American supernatural horror film directed by John Boorman and written by William Goodhart.  It stars Linda Blair, Richard Burton, Louise Fletcher, Max von Sydow, Kitty Winn, Paul Henreid and James Earl Jones.  It is a sequel to William Friedkin's 1973 film "The Exorcist" based on the 1971 novel by William Peter Blatty and the second installment of "The Exorcist" franchise.  The film is set four years after the original film and centers on the now 16-year-old Regan MacNeil, who is still recovering from her previous demonic possession.

Dead Sleep: Dead Sleep is a 1992 Australian horror film about a series of suspicious deaths that occur in a psychiatric ward.  The cast includes Linda Blair (who played the possessed girl in "The Exorcist"), veteran Australian actor Tony Bonner and Vassy Costiopoulos.  The film went straight to video.

L.A. 7: L.A. 7 (known as S Club 7 in L.A. in the U.S.) was the second series in the BBC television series, starring British pop group S Club 7.  The programme was shown every week on CBBC, from 6 April 2000 to 6 July 2000 and starred all seven members of the band as fictionalized versions of themselves.  The series featured star from "The Exorcist", Linda Blair as Joni, their landlord.

Regan MacNeil: Regan Teresa MacNeil (born November 11, 1961; adaptations: c. September 1963) is a fictional character from William Peter Blatty's horror novel and film, "The Exorcist" and its first sequel, "".  In both films, she was portrayed by Linda Blair.

Grotesque (1988 film): Grotesque is a 1988 horror film that was directed by Joe Tornatore.  Linda Blair, who previously starred in "The Exorcist", starred in the film and was the associate producer.  It was filmed at Big Bear Lake.

Repossessed (film): Repossessed is a 1990 American comedy film that parodies the 1973 horror film, "The Exorcist".  It was written and directed by Bob Logan.  The film features the original star of "The Exorcist", Linda Blair, as well as Leslie Nielsen and Anthony Starke.  Many gags parodied events in "The Exorcist", such as the green-vomit and head-spinning scenes.

The Blair Bitch Project: The Blair Bitch Project is a 1999 film starring Linda Blair.  It is a parody of "The Blair Witch Project".  Its full title is The Blair Bitch Project starring Linda Blair.

Linda Blair: Linda Denise Blair (born January 22, 1959) is an American actress and animal rights activist.  Blair is best known for her role as the possessed child, Regan, in the film "The Exorcist" (1973), for which she was nominated for an Academy Award and won a Golden Globe.  She reprised her role in "" (1977), for which she was nominated for a Saturn Award.

The Exorcist (film): The Exorcist is a 1973 American supernatural horror film, adapted by William Peter Blatty from his 1971 novel of the same name, and starring Ellen Burstyn, Linda Blair, Max von Sydow, and Jason Miller.  The film is part of "The Exorcist" franchise.  The book, inspired by the 1949 exorcism of Roland Doe, deals with the demonic possession of a 12-year-old girl and her mother's attempts to win back her child through an exorcism conducted by two priests.  The adaptation is relatively faithful to the book, which itself has been commercially successful (earning a place on "The New York Times" Best Seller list).

Supporting paragraphs: The Exorcist (film) Linda Blair
Answer: Regan