Rachel's sister is Leah, a four-letter name. Rachel and Leah are characters in the Bible, appearing in the Book of Genesis. Rachel was the younger daughter of Laban and the favorite wife of Jacob, while Leah was the elder daughter of Laban and the first wife of Jacob. Leah was initially unloved by Jacob, but eventually bore him six sons and a daughter. Rachel and Leah's relationship was strained due to their father's favoritism towards Rachel, and the competition between them for Jacob's affections.