The spelling of "McMiller" can be explained using the International Phonetic Alphabet (IPA). The first syllable, "Mc", is pronounced as /mək/ with a schwa sound followed by the consonant 'k'. The second syllable, "Miller", is pronounced as /ˈmɪlər/ with stress on the first syllable and the final 'r' being pronounced with a non-silent sound. So the overall spelling of "McMiller" is phonetically transcribed as /məkˈmɪlər/. This transcription helps to understand the correct pronunciation of the word.