You searched for: “anonymous stranger”
anonymous stranger (s) (noun), anonymous strangers
An unnamed stranger is someone who is not known and whose name has obviously not been revealed.
Could this be a pleonasm or a redundancy?
This entry is located in the following units: -onym, -onymy, -onymic, -onymically, -onymous, -onymously, -nym (page 2) Pleonasms or Tautological Redundancies (page 2)