The word "Jonyssa" is spelled with the letter J, followed by the letters O-N-Y-S-S-A. The sound of the letter J is represented by the IPA phonetic symbol /dʒ/, which is a voiced palato-alveolar affricate. The combination of the letters ONY represent the diphthong /oʊ/ which has a sound of an "oh" sound and an "ee" sound combined. The letters SSA are pronounced as /sə/ which represents an unstressed syllable sound. Therefore, the correct way to spell Jonyssa is with a J, followed by ONYSSA.