'House of Judah' in the Bible

And when Rehoboam was come to Jerusalem, he gathered of the house of Judah and Benjamin to the number of nine score thousand choice men of war to fight with Israel, for to bring the kingdom again to Rehoboam.

And see here, Amariah the priest which is head over you in all matters of the LORD; and Zebadiah the son of Ishmael, a ruler in the house of Judah, he is over all causes concerning the king, with officers of the Levites before you. Take courage to you and go upon it, and the LORD shall be with the good."

For Athaliah the mother of Ahaziah, when she saw her son was dead, arose and destroyed all the seed of the kingdom of the house of Judah.