The spelling of the word "McCrohan" can be explained using the International Phonetic Alphabet (IPA). The first syllable "Mc" is pronounced as "mək", with the "c" representing the "k" sound. The second syllable "Cro" is pronounced as "kroʊ", with the "o" representing a diphthong of the "ow" sound. The final syllable "han" is pronounced as "hæn", with the "a" representing the short "a" sound. Overall, the spelling of "McCrohan" reflects its Irish ancestry and the use of the "Mc" prefix in many Irish surnames.