inconnu

UK: /ˈɪnkənuː/

US: (in′kə no̅o̅′, -nyo̅o̅′, ing′-; Fr. an kô ny′)

WordReference Random House Unabridged Dictionary of American English © 2025

in•con•nu  (in′kə no̅o̅′, -nyo̅o̅′, ing′-; Fr. an kô ny′), n., pl. -nus (-no̅o̅z′, -nyo̅o̅z′; Fr. -ny′), (esp. collectively for 2) -nu. 

1. a person who is unknown;
   stranger.
2. Fish Also called sheefish. a game fish, Stenodus leucichthys, of fresh or brackish northern waters.

• Latin cognōscere; see cognition
• French: literally, unknown, equivalent. to in- in-³ + connu, past participle of connaître to know, be acquainted with
• 1800–10

Collins Concise English Dictionary © HarperCollins Publishers::

inconnu / ˈɪnkənuː/ noun

1. a North American freshwater food and game fish, Stenodus leucichthys, related to the salmon
2. an unknown person

Etymology: 19th Century: from French, literally: unknown