I wanted to read the book: Milkman. Here is the first sentence of this book: "The day Somebody McSomebody put a gun to my breast and called me a cat and threatened to shoot me was the same day the milkman died."
What's the meaning of the word "McSomebody" here? I checked many dictionaries but I couldn't find any answers
Putting 'Mc' on the front of a word is a way of making a connection to the name McDonald's, a ubiquitous fast food restaurant chain and their habbit of naming menu items in that manner: McNuggets, McRib, etc.
That gave us terms like McJob and names like Boaty McBoatface.
So the writer is talking about a generic somebody, an unknown person with a mass-produced impersonality.
The usage when applied to names precedes McDonalds and frequently isn't associated with the chain. Instead, "Mc-" is a common form for making generic names, derived from Scottish and Irish patronyms.
The Oxford English Dictionary lists this as its first entry for "Mc-, comb. form:"
Prefixed chiefly to nouns to create mock names denoting a person who (or occasionally thing that) is considered an exemplar or personification of the specified class, interest, association, etc.
The first example is from the 1940s:
1948, San Francisco Call-Bull. 21 Dec. 20/1: "Dear McSanta: All I want is a few extra college credits."
So "Somebody McSomebody" is a generic person, perhaps to the point of mocking.
