The word "mcgahan" is a surname that is pronounced as /məˈɡæhən/. The first syllable "mc" is a common prefix in Irish surnames and is pronounced as "mac", meaning "son of". The "g" in "mcgahan" is pronounced as a hard "g" sound like "go", and the "a" is pronounced as a short "a" like "cat". The final syllable "han" is pronounced with a short "a" and the "h" is silent. Thus, the correct phonetic transcription of "mcgahan" is /məˈɡæhən/.