The Greek form Gad (G1045) represents the Hebrew גָּד (Gad), meaning "fortune" or "troop." Gad was the seventh son of Jacob (by Zilpah, Leah's maidservant) and the ancestor of the tribe of Gad. In Revelation 7:5, the tribe of Gad is listed among the twelve tribes sealed by God.
The tribe of Gad received territory east of the Jordan and was known for its warriors — Moses blessed Gad: "He dwells as a lion... he chose the best of the land" (Deuteronomy 33:20-21). Gad's inclusion in the Revelation 7 sealing confirms that God's covenant with the twelve tribes of Israel endures into the eschatological age. Not one tribe is lost; God's promises to Abraham, Isaac, and Jacob are fulfilled completely.