The spelling of the word "Koontz" is phonetically represented as /kuːnts/. The initial letter "K" is pronounced as a voiceless velar stop. The vowel sound /u:/ is followed by the consonant sound /n/, which is an alveolar nasal. The final consonant cluster /ts/ is a voiceless alveolar affricate, consisting of the affricate /t/ and the fricative /s/. This spelling convention reflects the pronunciation of the surname "Koontz", which is commonly found among English-speaking populations.