'Babel' - a biblical reference to the Tower of Babel?
I'm just going to spitball here and it's just my opinion anyway.
Initially, I had no clue why the title had to be so cryptic that I didn't understand why the movie was called BABEL as it was. But then soon it dawned on me that the name/title "Babel" might have been derived from the biblical reference to the Tower of Babel, especially where the medium of language is concerned.
I mean in the Bible, [the unified] mankind initially spoke a single language but then, by the Lord's Will, they spoke in many different languages.
Now, if that was to be the case then it made sense why "Babel" is the title of the movie since the movie was essentially about four interlocking stories whose characters in each scenarios spoke different languages and they all are about humanity.