Int. Standard Bible Encyclopedia ZAMZUMMIM zam-zum'-im (zam-zummim): A race of giants who inhabited the region East of the Jordan afterward occupied by the Ammonites who displaced them. They are identified with the Rephaim (Deuteronomy 2:20). They may be the same as the Zuzim mentioned in connection with the Rephaim in Genesis 14:5. See REPHAIM.

Multi-Version Concordance Zamzummim (1 Occurrence) Deuteronomy 2:20 (That also is accounted a land of Rephaim: Rephaim lived therein before; but the Ammonites call them Zamzummim, (WEB KJV JPS ASV BBE DBY WBS YLT)