It happened in prehistory along with the first language developments, but archeologists are keeping track of the oldest known name: https://en.wikipedia.org/wik

It happened in prehistory along with the first language developments, but archeologists are keeping track of the oldest known name: https://en.wikipedia.org/wiki/Kushim_(Uruk_period) https://en.wikipedia.org/wiki/Kushim_(Uruk_period)