The correct spelling of the word "McCartt" is /məˈkɑːrt/. The initial "Mc" represents the Irish prefix for "son of," while the remaining "Cartt" is believed to be a Scottish variation of "Carter." The pronunciation features a short "uh" sound for the first syllable, followed by a stressed "kahrt" with a long "a" sound. It's important to use correct spelling and pronunciation, especially when referring to individuals with this surname.