Duke Magdiel, duke Iram. These are the dukes of Edom.

Wesley's Notes

1:54 These are the dukes of Edom - Let us, in reading these genealogies, think of the multitudes that have gone thro' the world, have successively acted their parts in it, and retired into darkness. All these and all theirs had their day; many of them made a mighty noise in the world; until their day came to fall, and their place knew them no more. The paths of death are trodden paths. How soon are we to tread them?

Matthew Henry's Concise Commentary

28-54 The genealogy is from hence confined to the posterity of Abraham. Let us take occasion from reading these lists of names, to think of the multitudes that have gone through this world, have done their parts in it, and then quitted it. As one generation, even of sinful men, passes away, another comes. Ec 1:4; Nu 32:14, and will do so while the earth remains. Short is our passage through time into eternity. May we be distinguished as the Lord's people.