Naive is pronounced nai-EEV (IPA /naɪˈiːv/). Two syllables — 'ny' then 'EEV'; stress the second.
IPA: /naɪˈiːv/
Syllables: nai · EEV
Common ESL mistake: Learners say 'NAYV' as one syllable rhyming with 'wave'.
Tip: Two syllables — 'ny' then 'EEV'; stress the second.