The word "MacWilliams" is a Scottish surname commonly pronounced as /məkˈwɪliəmz/. The "Mac" prefix signifies "son of", whereas "Williams" is an English surname meaning "son of William". The spelling of "MacWilliams" follows the traditional English and Scottish Gaelic spelling conventions where "Mac" is capitalized and connected to the name it modifies. The emphasis is on the first syllable "Mac" and the rest of the word is pronounced as "will-yumz". The precise spelling of "MacWilliams" may vary depending on the region or local dialect.
The word "MacWilliams" is a surname of Scottish origin. It is derived from the Gaelic personal name "Mac Uilleim", which means "son of William". "Mac" indicates "son of" in Gaelic, and "Uilleim" is the Gaelic form of William. Over time, surname prefixes like "Mac" were often dropped, and the name evolved into "Williams". As a result, "MacWilliams" can be seen as an anglicized version of "Mac Uilleim", retaining both the Gaelic origin and the association with the name William.