As noted above, I think Paul is referencing Noah and the table of nations.
It's fine.
Id recommend John Waltons "the lost world of Adam and Eve" to summarize my views.
I tend to view Genesis 2 as a sequel to Genesis 1. Which means that all of mankind is created, in a spiritual sense, not material, in Genesis 1. And then the story zooms in on a specific holy space, Eden, and tells the story of Adam and Eve.
And that's where Cain's wife comes from. From humanity outside the garden.
When Paul says that all nations come from one [it doesn't say from one man, it just says from one], I just don't see Paul as trying to make a scientifically valid statement. I think he's just telling people that God is creator. And if there is a population of native tribes in some distant continent beyond the nations that Paul is aware of, I don't think that matters.
He's just speaking in theological terms, not biological. Adam is a spiritual head. A spiritual leader. The first elected priest-king of God's kingdom.
I don't see calling Adam "the first" as having anything to do with biology. But everything to do with his status as God's first chosen man.
So, all nations came from one, would be more of a theological concept. Not Paul trying to lay out a science lesson on genetics or bio
I don't view this as God breathing a soul into Adam. Rather, Adam in and of himself is the nephesh. That became living. So I don't think it's God giving a nephesh, a nephesh. If that makes sense.
I would see it as God giving a nephesh a reason or purpose for life.
does that mean that Adam’s mom and dad did not have a purpose for life?