“Well, my Bible does show it as 2 (Two) Corinthians and not Second Corinthians.”
That’s a shorthand, an abbreviation. If you turn to the first page of that book, I’m sure you’ll see the actual title. Nobody refers to it, when speaking, as “2 Corinthians”, because that is exclusively a written shorthand.
Similarly, if I was speaking, I wouldn’t say “Rev 20”, I would say “Revelations, chapter 20”.