John Doe
noun /ˌdʒɒn ˈdəʊ/
  /ˌdʒɑːn ˈdəʊ/
[usually singular] (North American English)- a name used for a person whose name is not known or is kept secret, especially in a court of law
 - an average man compare Jane Doe
 
Word Originmid 18th cent.: originally in legal use as a name of a fictitious complainant, corresponding to Richard Roe, used to represent the defendant.
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