Salmon. Hebrew and Chaldean, Salma, (Haydock) though we read Salmon in the following verse. (Calmet)

This is one argument adduced by Houbigant, to shew that this genealogy is now imperfect. He concludes that Salma ought to be admitted, as well as Salmon; and, as the reason for calling the first son of Ruth, Obed, “serving or ploughing,” seems rather harsh, as we should naturally expect some more glorious title. He thinks that the immediate son of Ruth was called Jachin, “he shall establish;” and that Solomon called one of the pillars before the temple by his name, as he did the other Booz, “in strength,” in honour of his ancestors. Báz icin means, “In strength (or solidity) it (he) shall (stand or) establish.” As the son of Booz established his father’s house, (ver. 10, 11,) so these pillars denoted the stability of the temple. We must thus allow that the hand of time has mutilated the genealogy of David, and that two ought to be admitted among his ancestors, who have been here omitted, as St. Matthew likewise passes them over as well as three others, who were the descendants of Joram. The same omission of Jachin occurs 1 Paralipomenon ii. 11, where we find Salma instead of Salmon. Houbigant supposes that the sacred writers, Esdras and St. Matthew, gave the genealogies as they found them, without correcting the mistakes of transcribers. (Chronolog. sacra, p. 81.) But there might be some reason for the omission which we do not know; and Nahasson, Booz, and Joram might be said to beget Salmon, Obed, and Jechonias, though they were not their immediate children. Salien and many others assert, that there were three of the name of Booz, succeeding each other, so that six persons instead of four fill up the space of 440 years, from the taking of Jericho till the building of the temple. Salien, in the year of the world 2741, in which year he places the birth of the third Booz, who married Ruth, seventy years afterwards. Petau allows 520 years from the coming out of Egypt till the fourth year of Solomon, so that he leaves above 420 years to the three generations of Booz, Obed, and Isai. But he prudently passes over this chronological difficulty. Usher supposes that each of these people were almost 100 years old when they had children; and he produces many examples of people who lived beyond that age, but he does not mention any, since the days of Moses, who had children at such an advanced age, much less that many in the same family, and in succession, were remarkable for such a thing. Moreover, according to Houbigant’s chronology, Booz and Obed must have had children when they were almost 120, and Isai in his 107th year. But by admitting Salma and Jachin, the five persons might each have sons when they were about seventy, and thus would complete 347 years. See chap. ii. 1. (Haydock).