"Summerson" is a surname that is spelled using the English alphabet. The IPA phonetic transcription for this word would be /ˈsʌməsən/. The first syllable is pronounced with a short "u" sound followed by an unstressed schwa sound. The second syllable is pronounced with a short "i" sound, and the final syllable is pronounced with an unstressed schwa sound followed by an "n" sound. The spelling of "Summerson" reflects the way the word is pronounced in English.