IPA: /ɪnˈkʌnuː/
KK: /ɪnˈkɒnuː/
A person or thing that is not known or identified.
The artist remained an inconnu, with no one knowing his true identity.
Inconnu → The word comes from Old French 'inconnu' (meaning unknown), which is formed from the prefix 'in-' (meaning not) and 'connu' (meaning known, from the Latin 'cognitus'). Thus, 'inconnu' means not known or unknown.
Think of 'not' ('in-') and 'known' ('connu') to remember that 'inconnu' refers to something that is unknown.
No commonly confused words.