is mac short for macaroni or mac and cheese
Macaroni and cheese Macaroni and cheese—also called mac and cheese in American, Canadian, and macaroni pie in Caribbean English;[1] and macaroni cheese in the United Kingdom[2]—is a dish of English origin, consisting of cooked macaroni pasta and a cheese sauce, most commonly cheddar. It can also incorporate other ingredients, such as breadcrumbs, meat and vegetables.[3][4]
Mac and Mc together A convention of sorting names with the Scottish and Irish patronymic prefixes Mac and Mc together persists in library science and archival practice. An example is from the Archives at the Yale University Beinecke Rare Book and Manuscript Library.[1] It is also applied in areas such as voter registration, where Mac and Mc names may be sorted together in a listing.[2] Technically this is a convention in collation.