Judah is the fourth son of Jacob and Leah and became the family leader. His name means “praise” because Leah decided to praise God at the birth of this son. The tension in this family that is reflected in the names of the sons is astonishing; the lesson here is don’t marry sisters:-)

His first recorded act after being tapped to be family leader was to sell Joseph to the Ishmaelites; so that they would profit from the loss of a brother. I read the story in chapter 38 as occurring quickly but Er, the first born, would have been only thirteen when Joseph became ruler of Egypt so the incident with Tamar must have been around the beginning of the famine. (a movie made an interesting point that he moved out to get away from a grieving Jacob) Remember Tamar is a grandmother of Jesus which is why this part is included in Scripture. He does seem to take a positive lead of the family in chapter 43 when he repeats the deal Reuben tried to make with Joseph. He is the main spokesman in chapter 44:16 and Jacob sent him for directions in 46:28.

Jacob at the end of Genesis leaves this blessing for Judah: Genesis 49:⁸ “Judah, your brothers will praise you; your hand will be on the neck of your enemies; your father’s sons will bow down to you.
⁹ You are a lion’s cub, O Judah; you return from the prey, my son. Like a lion he crouches and lies down, like a lioness—who dares to rouse him?
¹⁰ The scepter will not depart from Judah, nor the ruler’s staff from between his feet,
until he comes to whom it belongs and the obedience of the nations is his.
¹¹ He will tether his donkey to a vine, his colt to the choicest branch; he will wash his garments in wine, his robes in the blood of grapes. ¹² His eyes will be darker than wine, his teeth whiter than milk.

That blessing pretty well covers everything: family leadership, authority over his enemies, personal wealth and good looks.

The two main people from Judah in the Exodus story are Bezalel, the artist, found in Exodus 35:30 and Caleb, the faithful spy, first mentioned in Numbers 13:6. Both of these men are again mentioned in 1 Chronicles 2 where the clans of Judah and the family of Jesse, David’s father, and David’s sons are discussed. This family history goes to chapter 4:23 and covers Jabez and his pray. It also covers the rulers after the Exile. This family tree is repeated again in Matthew 1, which is Joseph’s line, and again in Luke 3:23, which is Mary’s family line.

Deuteronomy 33: ⁷ And this he (Moses) said about Judah: “Hear, O Lord, the cry of Judah; bring him to his people. With his own hands he defends his cause.
Oh, be his help against his foes!”

Jesus is from Judah through David’s son Nathan, brother of Solomon. In one sense much of the Old Testament is about that family; 1 & 2 Samuel, much of 1 Chronicles and the books of the Kings and 2 Chronicles covers that family. While the prophets spend many of their words talking about Jesus and His coming.

Pictures are from http://www.freebibleimages.org/illustrations/ , http://www.biblepicturegallery.com/Pictures/David.htm