Aliases of the Doctor

During his travels in time and space, the Doctor has employed many different aliases; sometimes only briefly and sometimes on an ongoing basis. Due to his refusal to tell all but a few people his real name, he has often had aliases assigned to him by others.

The Doctor's true name
The Doctor has only ever used aliases publicly — his given name has never been revealed, and as such the very name "The Doctor" is an alias. It was implied that his given name was ceremoniously withdrawn and stricken by his cousins, as punishment for a disgrace he visited upon his House. (NA: Lungbarrow) When asked about the Doctor's name, companion Perpugilliam Brown once said she'd been told she couldn't pronounce it (BBCR: Slipback).

River Song revealed to the Doctor that she knows his real name by whispering it into his ear. He seemed particularly shocked at this, later saying to her "there is only one reason I would ever tell anyone my name, only one time I could" (DW:Forest of the Dead). At least one other individual, Samantha Jones, was also told his real name (EDA: Unnatural History).

It was not his real name, as, for example, Carrionite "witchcraft", using true names, did not work on him. (DW: The Shakespeare Code) Other confirmation comes from Madame de Pompadour, who recognized it as an alias when she was briefly connected to the Doctor's mind (DW: The Girl in the Fireplace); by Evelina as she attempted to foretell the Doctor's future (DW: The Fires of Pompeii), and by River Song when she revealed to the Doctor that she knew his real name (DW: Silence in the Library and Forest of the Dead).

Theta Sigma
Theta Sigma (informally or "Thete") was a nickname used by the Doctor during his years at the Time Lord Academy on the planet Gallifrey. (DW: The Armageddon Factor, The Happiness Patrol, DWM: Flashback) The name might also have been a codename used by some aspects of Time Lord government to refer to the Doctor. (The Adventures of K-9 series)

The Doctor
The Doctor chose his name himself, one also used by other Time Lords. (DW:The Sound of Drums) On at least one occasion, a Human knew this name without the Doctor even saying it out loud. (NA: Cat's Cradle: Warhead) His other aliases have usually had the alias "Doctor". He implied to Peri that his given name also began with such a title (DW: The Trial of a Time Lord: The Mysterious Planet). During his first incarnation, he adopted this incarnation for the benefit of Human colonists on the planet Iwa at the same that his grand-daughter Susan adopted the name "Susan". (TN: Frayed)

John Smith
John Smith was the alias the Doctor generally uses on Earth, when a name is often required. It is usually preceded by the title "Doctor", but not always - for example, when working undercover as a teacher at a school and as a patient in a hospital. (DW: School Reunion, Smith and Jones) It was originally given to him by Jamie during his second incarnation. (DW: The Wheel in Space) He adopted it on a semi-regular basis during his third incarnation while exiled on Earth when he served as scientific advisor to UNIT. (DW: Spearhead from Space) As "John Smith" is considered a very generic name in some Earth cultures, the Doctor's use of the alias is occasionally treated with skepticism by others (DW: Midnight).

Uses of this alias

 * During his exile on Earth with UNIT. (DW: Spearhead from Space, The Time Warrior)
 * A modification of this name, Johann Schmidt, was used by the Doctor while impersonating a Nazi Reichsinspektor. (NA: Timewyrm: Exodus)
 * Given to him serendipitously by Chang Lee on his hospital admittance forms. (DW: Doctor Who: The TV Movie)
 * Undercover as a science teacher at Deffry Vale High School. (DW: School Reunion)
 * Undercover as a patient at Royal Hope Hospital. (DW: Smith and Jones)
 * When the Doctor uses the Chameleon Arch to change into a human, he uses this name for his new personality (DW: Human Nature and The Family of Blood)
 * When investigating Adipose Industries (DW:Partners in Crime)
 * Aboard the Crusader 50 bus on the planet Midnight, the Doctor eventually offers this as his name when the humans trapped aboard the bus with him demand he give it. (DW:Midnight)
 * When "reintroducing" himself to Donna Noble. (DW: Journey's End)

Merlin
Either a future (i.e. after his seventh incarnation) or alternative incarnation of the Doctor wizard, Merlin in another universe. The sorceress Morgaine is convinced of this, and the Doctor does not deny it. He was also able to open a door that is supposedly voice-print coded to respond to Merlin's voice. (DW: Battlefield)

Doctor Caligari
Name used by the Doctor when he arrived in Tombstone, impersonating a magician. (DW: The Gunfighters)

Doctor von Wer
Doctor von Wer was an alias briefly adopted by the Doctor during his visit to Scotland in 1745. It is simply Doctor Who translated into German. He also signed a note Doctor W around this time. (DW: The Highlanders)

?
When the Doctor is asked to sign a document in during a visit to London in 1963, he does so by signing a question mark. (DW: Remembrance of the Daleks) The Doctor also appears to sign a document in a similar fashion prior to the Sontaran invasion of Gallifrey (DW: The Invasion of Time.

Doctor James McCrimmon
The Doctor took the name James McCrimmon while visiting Scotland in 1879; this was the name of Jamie McCrimmon. (DW: Tooth and Claw)

Doctor Vile
The Doctor briefly masqueraded as the space pirate Doctor Vile in order to stop a war. (DW: The Infinite Quest)

Doctor McCoy
After a discussion with Donna Noble, in which she compared the sonic screwdriver with Star Treks tricorder, the Doctor adopted the alias Dr. McCoy' when dealing with a group of soldiers. (Donna called herself Captain Kirk.) The ruse fell apart when Donna was unable to maintain the pretence of being a captain. (TDA: Pest Control)

Doctor Who
The name "Doctor Who" has been applied to the Doctor, intentionally or unintentionally, on many occasions. The computer WOTAN referred to the Doctor as Doctor Who, for reasons which have never been explained. (DW: The War Machines) Clive Finch also used this name when referring to the Doctor on his website Who is Doctor Who? (DW: ''Rose).)

Doctor Galloway
Edward Waterfield made up this name for the Doctor when arranging to meet him (DW: The Evil of the Daleks).

Quiquaequod
Miss Hawthorne referred to the Doctor as "the great wizard Quiquaequod" while attempting to bluff the villagers of Devil's End into releasing him. "Qui", "quae" and "quod" are the masculine, feminine and neuter forms of "who" in Latin. (DW: The Daemons)

The Evil One
The Sevateem tribe referred to the Doctor as The Evil One, due to the fact that the supercomputer they worshipped had a split personality, one of which being based on the Doctor (DW: The Face of Evil)

Old One
The Doctor was sometimes called an "Old One" by some indigenous populations. (DW: The Mysterious Planet, Paradise Towers) )

Pretty Boy
Professor River Song referred The Doctor as "Pretty Boy" in DW : Silence in the Library. Unaware River Song was trying to get his attention, The Doctor bursts in to attention after realising with everyone gone silent he was the pretty boy, flattering himself.

The Ka Faraq Gatri
The Daleks referred to the Doctor as the Ka Faraq Gatri, which may mean Bringer of Darkness and/or Destroyer of Worlds. By implication, the name Destroyer of Worlds refers to the Doctor's destruction of the Dalek home planet Skaro in his seventh incarnation, an act for which he would consequently feel some remorse. (DW:Remembrance of the Daleks, NA: Timewyrm: Revelation) However, as early as his second incarnation, the Doctor knew that the Daleks had given him this name, and the Daleks used it prior to the destruction of Skaro. (DWM: Bringer of Darkness, DW: Remembrance of the Daleks (novelisation)). The name was again used by Davros upon his near destruction. (DW: Journey's End)

Time's Champion
Time's Champion was a title given to the Doctor to symbolise his service to Time during his seventh incarnation.

The Oncoming Storm
The Daleks also referred to the Doctor as the Oncoming Storm in the myths of their homeworld, as noted by his ninth incarnation, indicating that the Daleks feared him. (DW: The Parting of the Ways) This was also the name given to him by the Draconians, who were generally his allies, to indicate the traumatic events which so often accompanied his arrival. (NA: Love and War)

Rides In Night
The Doctor was known to the Pawnee Nation by the name Rides In Night. He was also known as The Brother to Coyote. (TDA: Peacemaker)

Snail or Wormhole
Given to him by his cousins of the House of Lungbarrow, because, unlike Loomed Gallifreyans, he had a bellybutton. (NA: Lungbarrow)

Professor
Ace often called the Doctor Professor. She continued to use the term, even after he'd asked her not to do it any more. (DW: Dragonfire)

Mr. Spock
Rose Tyler, annoyed with the Doctor not telling her his name, proceeds to introduce him to Captain Jack as Mr. Spock, after the character from Star Trek. Jack proceeds to address the Doctor as Mr. Spock until he is corrected. (DW: The Empty Child)

Spartacus
During a visit to Pompeii, the Doctor used this name. (DW: The Fires of Pompeii)

Boss
Affectionate nickname given to him by Mickey Smith (DW: Journey's End).