Soup as a dish, or the etymology of the word "soup"? Because soup as a dish predates recorded history certainly[1] (evidence found for it as far back as 20,0000 BC) but possibly even the modern human species. And if the dish is that old and universal, every culture would have its own name for it. "supa" and "soup" sounding similar is probably just a coincidence.
1. https://en.wikipedia.org/wiki/Soup