The spelling of the word "Coltharp" can be explained using IPA phonetic transcription. The initial sound is a voiceless velar stop /k/, followed by an open-mid back unrounded vowel /ɔ/. The third sound is a voiceless alveolar fricative /θ/. Next, there is a voiced alveolar stop /d/, followed by an open-mid back rounded vowel /ɑ/. Finally, there is a voiceless bilabial plosive /p/. This unique combination of sounds gives the name its distinct spelling and pronunciation.