Here is, I. The family of Jacob. His twelve sons are here named, that illustrious number so often celebrated almost throughout the whole Bible, from the first to the last book of it. At every turn we meet with the twelve tribes that descended from these twelve patriarchs. The personal character of several of them was none of the best (the first four were much blemished), and yet the covenant was entailed on their seed; for it was of grace, free grace, that it was said, Jacob have I loved - not of works, lest any man should boast.
II. The family of Judah. That tribe was most praised, most increased, and most dignified, of any of the tribes, and therefore the genealogy of it is the first and largest of them all. In the account here given of the first branches of that illustrious tree, of which Christ was to be the top branch, we meet, 1. With some that were very bad. Here is Er, Judah's eldest son, that was evil in the sight of the Lord, and was cut off, in the beginning of his days, by a stroke of divine vengeance: The Lord slew him, Ch1 2:3. His next brother, Onan, was no better, and fared no better. Here is Tamar, with whom Judah, her father-in-law, committed incest, Ch1 2:4. And here is Achan, called Achar - a troubler, that troubled Israel by taking of the accursed thing, Ch1 2:7. Note, The best and most honourable families may have those belonging to them that are blemishes. 2. With some that were very wise and good, as Heman and Ethan, Calcol and Dara, who were not perhaps the immediate sons of Zerah, but descendants from him, and are named because they were the glory of their father's house; for, when the Holy Ghost would magnify the wisdom of Solomon, he declares him wiser than these four men, who, though the sons of Mahol, are called Ezrahites, from Zerah, Kg1 4:31. That four brothers should be eminent for wisdom and grace was a rare thing. 3. With some that were very great, as Nahshon, who was prince of the tribe of Judah when the camp of Israel was formed in the wilderness, and so led the van in that glorious march, and Salman, or Salmon, who was in that post of honour when they entered into Canaan, Ch1 2:10, Ch1 2:11.
III. The family of Jesse, of which a particularly account is kept for the sake of David, and the Son of David, who is a rod out of the stem of Jesse, Isa 11:1. Hence it appears that David was a seventh son, and that his three great commanders, Joab, Abishai, and Asahel, were the sons of one of his sisters, and Amasa of another. Three of the four went down slain to the pit, though they were the terror of the mighty.

Five of them in all - "These were all chief men; and on them the spirit of prophecy rested." - T.

And Hur begat Uri, and Uri begat Bezaleel. Who yet is not thought to be the same Bezaleel we read of in Exo 31:2 though the fathers and grandfathers of both have the same names, and were of the same tribe.
though the fathers and grandfathers of both have the same names, and were of the same tribe.
1 Chronicles 2:21

ch1 2:21
ch1 2:21
ch1 2:21And afterward Hezron went in to the daughter of Machir the father of Gilead,.... Which Machir was the son of Manasseh, and Gilead was his grandson, Num 26:29 the Targum is,"but he enticed a virgin, the daughter of Machir;''which suggests, that he committed fornication with her, though he afterwards married her; her name is not mentioned; to me it seems to be Abiah, Ch1 2:24 and whom the Targum there calls the daughter of Machir:

whom he married when he was sixty years old; the Targum is sixty six; this seems to be his last wife:

and she bare him Segub; the same name with the youngest son of Hiel, who rebuilt Jericho, Kg1 16:34.

CHILDREN OF JESSE. (Ch1 2:13-17)

David the seventh--As it appears (Sa1 16:10; Sa1 17:12) that Jesse had eight sons, the presumption is from David being mentioned here as the seventh son of his father, that one of them had died at an early age, without leaving issue.