Jacob's Twelve Sons Named in Genesis 35
Genesis 35:22–26 answers the question of who Jacob's sons were by listing all twelve by mother. The list is set at a dark moment, right after Reuben's sin with Bilhah is reported.
Genesis 35:18: Who Named Benjamin?
Genesis 35:18 records two names for one child: Benoni, spoken by Rachel as she was dying, and Benjamin, given by Jacob. The verse tells us who named him and at what cost, not what the name means.