Israel
a name meaning "he struggles with God." God gave this name to Jacob, reflecting Jacob's lifelong struggle to get God's blessing. It also refers to the nation that came from the family line of Jacob.
The twelve tribes of the nation of Israel are from the family of Jacob (Israel).
A member of the nation of Israel is called an Israelite. See also the word Jew in this dictionary.
The true Israel are those who have submitted to God and have faith in Jesus.