The spelling of the word "Jennaro" can be explained using the International Phonetic Alphabet (IPA) transcription. The first sound in "Jennaro" is /dʒ/, which is a voiced palato-alveolar affricate sound. The second sound is /ɛ/, which is an open-mid front unrounded vowel. The third sound is /n/, which is a voiced alveolar nasal. The fourth sound is /ə/, which is a schwa sound. The final sound is /ɹoʊ/, which is a rhotic diphthong. Therefore, the correct spelling of "Jennaro" corresponds to its phonetic transcription: "dʒɛnəroʊ".