The spelling of the name "Jeff Eastin" is relatively straightforward. It starts with the voiced consonant /dʒ/ followed by the unvoiced fricative /f/. The second syllable uses the vowel "e" pronounced as /ɛ/ and the voiced consonant "th" pronounced as /ð/. The final syllable has the vowel "i" pronounced as /i/ followed by the nasal consonant "n" pronounced as /n/. Overall, "Jeff Eastin" is spelled phonetically as /dʒɛf iːsθɪn/.