1. Son of Judah
And she conceived, and bare a son; and he called his name Er. (Genesis 38:3)
And Judah took a wife for Er his firstborn, whose name was Tamar. And Er, Judah's firstborn, was wicked in the sight of the Lord; and the Lord slew him. ({vi 1126-1127}Genesis 38:6-7)
And the sons of Judah; Er, and Onan, and Shelah, and Pharez, and Zerah: but Er and Onan died in the land of Canaan. And the sons of Pharez were Hezron and Hamul. (Genesis 46:12)
The sons of Judah were Er and Onan: and Er and Onan died in the land of Canaan. (Numbers 26:19)
The sons of Judah; Er, and Onan, and Shelah: which three were born unto him of the daughter of Shua the Canaanitess. And Er, the firstborn of Judah, was evil in the sight of the Lord; and he slew him. (1 Chronicles 2:3)
2. A son of Shelah
The sons of Shelah the son of Judah were, Er the father of Lecah, and Laadah the father of Mareshah, and the families of the house of them that wrought fine linen, of the house of Ashbea, (1 Chronicles 4:21)
3. An ancestor of, Jesus
Which was the son of Melchi, which was the son of Addi, which was the son of Cosam, which was the son of Elmodam, which was the son of Er, (Luke 3:28)