The spelling of "Illsa" can be broken down using IPA phonetic transcription. The first syllable "Ill" is pronounced as /ɪl/, which represents the short "i" sound and a clear "l" sound. The second syllable "sa" is pronounced as /sə/, which represents the "s" sound and a short "uh" sound. This spelling accurately represents the pronunciation of this name. It is important to use proper phonetic transcription to ensure accurate pronunciation in speech and writing.