There is pronounced THAIR (IPA /ðɛər/). Voiced 'th' — tongue between teeth with vocal-cord buzz, then 'air'.
IPA: /ðɛər/
Syllables: THAIR
Common ESL mistake: Learners say 'der' replacing voiced /ð/ with /d/.
Tip: Voiced 'th' — tongue between teeth with vocal-cord buzz, then 'air'.