The spelling of the name "Jillissa" is a bit unique, as it contains two sets of double letters. The first syllable of the name, "Jil," is pronounced with a soft "j" sound and the "i" is pronounced as the long "e" vowel sound. The second syllable, "lis," has a short "i" sound and is followed by another set of double letters, "s-s." The final syllable, "sa," is pronounced with a short "a" sound. Overall, the phonetic transcription for "Jillissa" is dʒɪˈlɪsə.