The spelling of the word "Edmonson" is quite straightforward when considering its pronunciation. In IPA phonetic transcription, it is pronounced as "ɛdmənsən". The "Ed" in "Edmonson" is pronounced as "ɛd", the "m" as "m", the "o" as "əʊ", the "n" as "n", and the ending "son" as "sən". Overall, the spelling corresponds well with its pronunciation and follows conventional English spelling rules.