Genesis 12 was addressed to Abram (later Abraham), but Abraham was neither an Israelite nor a Jew:
Genesis 12:2-3 "I will make you into a great nation and I will bless you; I will make your name great, and you will be a blessing. I will bless those who bless you, and whoever curses you I will curse; and all peoples on earth will be blessed through you."
There were no Jews at the time of Abraham, There were not even any Israelites. There would not be any Jews for another ~1,500 years.
The "Great Nation" provision is important because since it was promised by God it will (or has) come true. As we examine the Israelites history it is clear those Israelites called Jews were never a great nation and are not one today. They don't come even close to ranking among the worlds great powers.
However, the other Israelites, the Northern Kingdom/LostTribes/Celts/Europeans/Americans are The Greatest POWER (Nation) in the history of the world. No nation in the history of the world has been a greater blessing to all the people of the earth than these Northern Kingdom Israelites!
And the other promises to Abram do enure to certain of his offspring as told in: Genesis 17:19-21
19. And God said, Sarah thy wife shall bear thee a son indeed; and thou shalt call his name Isaac: and I will establish my covenant with him for an everlasting covenant, and with his seed after him.
20. And as for Ish'ma-el, I have heard thee: Behold, I have blessed him, and will make him fruitful, and will multiply him exceedingly; twelve princes shall he beget, and I will make him a great nation.
21. But my covenant will I establish with Isaac, which Sarah shall bear unto thee at this set time in the next year.
Isaacs seed includes Jacob (renamed Israel), and those who follow in that chain are called Israelites. All these Israelites received the promises of Abraham. But Israelites are not just those few who much later became known as Jews.