I would imagine there was a group which were the forebears of all Germanic peoples, the Goths etc.
There was a group that represented the beginning of all Mediterranean peoples, the Etruscans, Romans, Classical Greeks, etc.

What were the names of the OLDEST examples of these peoples ? And were there any other divisions that are known ?
Perhaps I should rephrase the question.

I don't mean the birth of the human race as we know it LOL

I mean the first emerging homogeneous cultures in the early centuries BCE, around the time that for example the, Romans first emerged.

So I suppose I mean the bronze age cultures, and their recorded ancestors.