The word "McPhearson" is a surname that is commonly misspelled due to its unusual spelling. Its correct pronunciation is /məkˈfɪrsən/, which can help explain its spelling. The "Mc" at the beginning is a common prefix in Scottish and Irish surnames, indicating a connection to a particular clan or family. The "Phe" in the middle represents the "f" sound, while the "ar" represents the "er" sound. The final "son" is a common suffix meaning "son of". So, "McPhearson" can be understood as "the son of the one from the clan or family of MacPherson, with the 'f' and 'er' sounds represented in an unusual but consistent way."
The word McPhearson does not seem to have a widely recognized etymology as it does not correspond to a common word or name. It appears to be a surname that might have Scottish origins, given the presence of the prefix Mc- which is commonly found in patronymic surnames in Scotland. However, without further information or context, it is challenging to determine the precise etymology of the word McPhearson.