Many references to God in the Old Testament were things like “The God of the Isrealites” and things like that. He is the one true God.
The one that is eminently defining is ... the “God of Abraham, Isaac and Jacob” ... as God himself uses that repeatedly.
God changed the name of Jacob to “Israel” and then the next generation produced the twelve tribes of Israel. You can’t go off base here, because that locks it down very tight ... right down to the specifics and with Israel.
AND it’s through Israel that God brings forth His Son, who is the Messiah of Israel and who will actually be physically present in the city of Jerusalem, ruling over his one-world government, over these very nations we talk about here on this forum.