Note:  Do not rely on this information. It is very old.

Gad

Gad. 1. The son of Jacob and Leah, and founder of the tribe bearing his name, who were shepherds and also great warriors.

2. A prophet or seer - probably a pupil of Samuel - friend of David, whom he joined in the evil days of his fortune, and whose prosperity he also shared, receiving at Court the name of "the king's seer." He organised the musical services and wrote a chronicle of David.