The Hebrew name Otsem (H684) means "strong" or "strength" and appears twice in the Old Testament — once as a son of Jesse (a brother of David) in 1 Chronicles 2:15, and once as a son of Jerahmeel in 1 Chronicles 2:25.
Otsem was a brother of King David, part of the family through which God's covenant promises to Israel were channeled. The preservation of Jesse's sons' names, including those who did not become king, reflects the truth that God's purposes are worked out through entire families and generations — not just the famous few. All of David's brothers played a role in the covenant history that led to the Messianic line.