The name John Doe is used as a placeholder for a person whose real identity is unknown, legally protected, or beside the point. It began as a workaround in medieval English property courts roughly seven centuries ago, and it stuck because every legal and administrative system since has needed a reliable way to name someone it cannot yet identify. Today you will see it on lawsuits, arrest warrants, hospital charts, and immigration paperwork, doing the same job in each place: holding a spot until a real name can take over, or standing in permanently when a real name would cause harm.
The Medieval Workaround That Started It
The story begins with English property law in the 1300s. Landlords trying to reclaim land from squatters or defaulting tenants faced a court process so tangled in technicalities that it was practically useless. To sidestep it, they filed a different kind of lawsuit, an “action of ejectment,” on behalf of a made-up tenant named John Doe against another fictional person named Richard Roe, who had supposedly kicked Doe off the property. To resolve the invented dispute, the court first had to establish who actually owned the land, which was the landlord’s real goal all along.
No one has pinpointed the first case to use the names. The leading theory is simple: John and Richard were among the most common men’s names in medieval England, and “doe” and “roe” are both types of deer, possibly a bit of legal wordplay or just a convenient rhyme that made the pair easy to remember. English courts eventually used the names as all-purpose placeholders whenever a party’s real identity was unavailable, and when the American legal system inherited English common law, John Doe came with it.
Why Lawsuits Still Need a Placeholder Defendant
Federal court rules require a complaint to name every party involved.1United States Courts. Federal Rules of Civil Procedure But sometimes the person who harmed you cannot be named yet. A hit-and-run driver, an anonymous online poster, a manufacturer hidden behind layers of distributors: the responsible party exists, but you don’t know who they are. Filing against John Doe lets the lawsuit begin while you work out who actually belongs in the defendant’s chair.2Legal Information Institute. John Doe
The plan is always to swap in the real name once you learn it. Discovery, subpoenas for records, depositions, and forensic analysis usually surface the defendant’s identity, and the complaint is amended. Timing matters, though. Federal rules allow an amended complaint to “relate back” to the original filing date only in narrow circumstances, and several federal appeals courts have read those limits strictly, which is where many John Doe cases quietly fall apart when the statute of limitations runs.3Legal Information Institute. Federal Rules of Civil Procedure Rule 15
The same placeholder has become central to lawsuits over anonymous internet speech. When someone posts a defamatory review, a threatening message, or protected trade secrets under a screen name, the injured party sues John Doe and then subpoenas the platform for the poster’s identity. Courts have recognized that unmasking an anonymous speaker touches First Amendment interests, so they do not hand over identities on request; the plaintiff generally has to show a real case on every element of the claim and make reasonable efforts to notify the anonymous defendant that the subpoena is coming.
Why Prosecutors Use It in Criminal Cases
Criminal investigations put John Doe to a different use. When police have a suspect’s DNA from a crime scene but no name to attach it to, prosecutors in some jurisdictions file a John Doe arrest warrant that identifies the suspect entirely by genetic profile, describing the defendant as an unknown person with matching DNA at specific genetic locations.4RTI International. Understanding the Use of John Doe Arrest Warrants in Prosecuting Cold Case Sexual Assault
The point is to stop the clock. Filing the warrant tolls the statute of limitations, so prosecutors do not lose the ability to charge the crime just because they have not matched the DNA to a name yet.4RTI International. Understanding the Use of John Doe Arrest Warrants in Prosecuting Cold Case Sexual Assault Courts have upheld the practice on the reasoning that a DNA profile identifies a person with enough certainty to satisfy constitutional notice requirements.5National Institute of Justice. Principles of Forensic DNA for Officers of the Court – John Doe Warrants The approach has mattered most for cold case sexual assaults, where backlogged rape kits sometimes produce DNA matches years or decades after the crime.
Why Plaintiffs Sometimes Use It Themselves
John Doe also appears on the other side of a caption. Someone suing over a sexual assault, an HIV-related discrimination claim, or a challenge to government surveillance may have strong reasons to keep their name out of public records. Federal rules generally require real names, so proceeding as John Doe or Jane Doe requires permission from the court.2Legal Information Institute. John Doe
Judges weigh the request against the public’s interest in open court proceedings. Factors vary by circuit, but most courts look at whether revealing the person’s identity would risk physical retaliation, whether the case involves deeply personal matters like health or sexuality, whether the opposing party would be unfairly prejudiced, and whether the public has a meaningful interest in knowing who is involved. Cases involving children routinely use pseudonyms or initials, which is why published decisions often carry captions like “D.M.” or “N.O.” instead of full names.6Justia. 329 F.3d 1286 – John Doe v. Kearney
Why Hospitals and Government Offices Use It Too
The need for a placeholder name is not confined to courts. When an unconscious or unresponsive patient arrives at a hospital without identification, staff need a name immediately for the medical chart, lab orders, medication tracking, and communication between providers. John Doe and Jane Doe have traditionally filled that role, but many hospitals have moved to more sophisticated systems because a single John Doe label falls apart when multiple unidentified patients arrive at once.
Some facilities now use randomized combinations of state names and colors, like “Purple Montana,” to make verbal communication easier than reciting long ID numbers. After the 2017 Las Vegas mass shooting, one hospital ran through its entire list of placeholder names and switched to using the NOAA hurricane name list for first names paired with “Trauma” as a last name.7ASPR TRACIE. Naming Convention for Unidentified Patients Other systems assign a code word like “Omega” to flag the patient as a disaster victim, followed by a batch identifier and an unusual name unlikely to match any real person. The common thread is avoiding confusion between patients, because a mix-up in a trauma bay can be fatal.
Government databases run into a related problem. Immigration forms require a two-part name structure, given name and family name, but millions of people worldwide use a single legal name. When someone with a mononymous name applies for a green card, visa, or work permit, USCIS places the single name in the family name field and enters “FNU” (First Name Unknown) or “No Name Given” as the given name.8USCIS. USCIS Policy Manual Volume 1, Part E, Chapter 5 That workaround can cascade through driver’s licenses, Social Security records, and employment paperwork, creating real headaches for people whose identification reads “FNU” as though it were their first name.
The Rest of the Doe Family
The John Doe family has grown over the centuries to cover situations where a single generic name isn’t enough:
- Jane Doe: The female counterpart, used for unidentified women or female parties whose identity is protected. “Jane” likely emerged because it was common and phonetically close to “John.”
- Richard Roe: The original second placeholder from medieval ejectment actions, used when a case involves more than one unknown party. John Doe is always the first unnamed person; Richard Roe is the second.
- Baby Doe: Used for unidentified or abandoned infants, particularly in forensic and child welfare contexts.
- Jane Roe: Gained lasting public recognition as the pseudonym for Norma McCorvey, the plaintiff in the 1973 Supreme Court case Roe v. Wade, who challenged Texas abortion laws under that name to protect her privacy.
- John Stiles and Richard Miles: Less common today, but historically assigned as the third and fourth unnamed parties when a case involved more than two unknown individuals.
When a modern case involves many unnamed defendants, say dozens of anonymous online posters, courts typically number them: John Doe 1, John Doe 2, and so on. The older named variations mostly survive in legal history and textbooks rather than active litigation, with the exception of Jane Doe, which remains as common as its male counterpart.