'The Invention of Prehistory' Review: Facing Deep Time
wsj.com
wsj.com
the movie you speak of is the first on the list: Quest for Fire (1981)
There are actually two distinct languages (a kind of Proto-Proto-Proto-Indo-European and Proto-Proto-Proto-Uralic) spoken in the movie, created by Anthony Burgess. He later wrote an essay (the title of which escapes me ATM) about the thinking behind it.
Some background: https://www.anthonyburgess.org/quest-for-fire/about-quest-fo...
https://archive.is/20240311220449/https://www.nytimes.com/19...
I find it amusing that we can reconstruct that PIE speakers had a verb for "to get high", but we can't reconstruct their noun for "bear", because it was taboo: speaking of the bear was like speaking of the devil, and so all we know are all the different ways the different languages chose to talk about the bear without saying its name.
All we have left is modern speculation and imagination.
Notable because it's so old, but it gives you an upper bound.
The story of who a person was can easily be a combination of many.
This all to say that the word (and the sacred culture attendant) is far older and far broader than can be ascribed to some just-so story of a prehistoric, let alone proto-Greek, warlord. If I were to look for origins of “Zeus,” the god, I would instead first contemplate how vast the sky appears when seen from the steppe (whence the Yamnaya, first speakers of this language family). How does one not imagine a sky father in that seeming infinity?
I think the real cultural memory of the Neanderthals and other species related to us is in the myths of Titans and Giants. People who were on earth first and who battled furiously with man-like gods for dominance.