Ibn Ishaaq stated that he was a man of Rum. His name was Job, Ibn Mose, Ibn Razeh, Ibn Esau, Ibn Isaac , Ibn Abraham . Someone else said he was Job, Ibn Mose, Ibn Rimil, Ibn Esau, Ibn Isaac, Ibn Jacob. There have also been other statements on his lineage. Ibn Asaker narrated that his mother was a daughter of Lot . It was said, also, that his father was one who believed in Abraham when he was cast into the fire.
The first opinion is the most plausable, because he was a descendant of Abraham's offspring as Allah Almighty declared: And that was Our proof which We gave Abraham against his people. We raise whom We will in degrees. Certainly your Lord is All-Wise, All-Knowing. And We bestowed upon him Isaac and Jacob, each of them We guided, and before him, We guided Noah, and among his progeny David, Solomon, Job, Joseph, Moses, and Aaron. Thus do We reward the good-doers. Surah 6: 83-84