Charles Ellicott Commentary 1 Chronicles 5:3

"the sons of Reuben the first-born of Israel: Hanoch, and Pallu, Hezron, and Carmi." — 1 Chronicles 5:3 (ASV)

Hanoch, and Pallu, Hezron, and Carmi. —So Genesis 46:9; Exodus 6:14; Numbers 26:5–7. Considering the prominence of Hezron and Carmi among the clans of Judah, it is remarkable to find their names recurring among the main branches of Reuben.