a name used in law courts, legal papers, etc. to refer to a person whose actual name is unknown, esp. to the second person of two when both names are unknown (the first person being referred to as John Doe)
Origin of Richard Roesee Doe
Used as a name in legal proceedings to designate an unknown man or boy or to protect the identity of a known man or boy, especially where there is another such individual in the case designated as John Doe.