Judah. Put first because of his being chief. Compare Genesis 38:1-11.
Related Commentaries of 1 Chronicles 2:3
1 Chronicles 2:3
3 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.