Goliath
Goliath is described in the biblical Book of Samuel as a Philistine giant defeated by the young David in single combat. The story signified Saul's unfitness to rule, as Saul himself should have fought for the Kingdom of Israel.
Gad (prophet)
Gad () was a seer or prophet mentioned in the Hebrew Bible and the writings of Jewish historian Josephus. He was one of the personal prophets of King David of Israel and, according to the Talmudic tradition, some of his writings are believed to be included in the Books of Samuel. He is first mentioned in telling David to return from refuge in Moab to the forest of Hereth in the land of Judah.