Hadad = |mighty|
1) son of Ishmael
2) a king of Edom who gained an important victory over the Midianites on the field of Moab
3) another king of Edom, with Pau for his capital
4) a member of the royal house of Edom who escaped the massacre under Joab and fled with a band of followers into Egypt; after David's death, he returned to his own country