Appalachian English dialects in the US are supposed to be closest to those of London at the time of American colonization. Lox is a yiddish word, though, and while it may phonetically be widespread (as the article claims), the spelling and exact pronunciation in modern English likely spread with German Jewish immigrants. That's particular true in the northeastern US. The parent commenter was unfamiliar with the term, but anyone who grew up around New York would be familiar with it as a common deli item.
