The name "John Doe" is used as a name in a legal action, case or discussion for a male person, whose true identity is unknown or must be withheld for legal reasons. Male corpses or hospital patients whose identities are unknown may also be called "John Doe". The name "Jane Doe" is used for females.
John or Jane Doe is also use an example when a name is needed, for instance when showing how a form should be completed. "Joe Bloggs" is sometimes used in such a case.