Reuben

REUBEN. Heb. Reubain.. Jacob’s first-born son. Referred to in the Qur”an, Surah xii. 10: “A speaker from amongst them said, ‘Slay not Joseph, but throw him into the bottom of the pit; some of the travellers may pick him up.”
Al-Baizawi, the commentator, says the name of Joseph’s eldest brother was either Yahuza, or Rubil. Josephus gives the name as Roubel and explains it as the “pity of God.” (Ant. i, 19. s. 8.)

Based on Hughes, Dictionary of Islam