It's weird, but often instead of Monterrey Jack, I want to say Mercury Jack. It's the word that comes first in my brain, though I don't let it out of my mouth. It takes a few seconds to remember the proper name. I guess the words are pretty similar-looking in my brain. Oddly enough, I only seem to make the mistake when referring to the cheese and not the city, but it could simply be that I talk more about the cheese than the city, too.