Judah refers to a person, a tribe, and a nation.
Judah, the person, was one of Jacob’s twelve sons.
Jacob’s descendants grew in number and became the tribe of Judah, one of twelve tribes comprising the nation of Israel. Each tribe settled in an assigned geographic area, which would be similar to a state or province today.
Later, when the nation of Israel was divided, the tribes of Judah and Benjamin, split off, forming a new nation that was known as the nation of Judah.
Key verse about Judah: The sons of Leah: Reuben the firstborn of Jacob, Simeon, Levi, Judah, Issachar and Zebulun (Genesis 35:23, NIV).
A lifelong student of the Bible, Peter DeHaan, PhD, wrote the 700-page website ABibleADay.com to encourage people to explore the Bible. His main blog and numerous books urge Christians to push past the status quo and reconsider how they practice their faith in every area of their lives.