The sons also of Hezron, that were born unto him; Jerahmeel, and (c) Ram, and Chelubai.
(c) Whom Matthew calls Aram, (Matthew 1:3).

The sons also of Hezron, that were born unto him,.... The Targum adds, in Timnath; but most likely in Egypt:
Jerahmeel, and Ram, and Chelubai; afterwards called Caleb.

The only name given here as that of a descendant of Ethan is Azariah, of whom nothing further is known, while the name recurs frequently. Nothing more is said of the remaining sons of Zerah; they are merely set down as famous men of antiquity (Berth.). There follows in
1-Chronicles 2:9-41
The family of Hezron, the first-born son of Pharez, which branches off in three lines, originating with his three sons respectively. The three sons of Hezron are Jerahmeel, and Ram, and Chelubai; but the families springing from them are enumerated in a different order. First (1-Chronicles 2:10-17) we have the family of Ram, because King David is descended from him; then (1-Chronicles 2:18-24) the family of Chelubai or Caleb, from whose lineage came the illustrious Bezaleel; and finally (vv. 25-41), the posterity of the first-born, Jerahmeel.

לו נולד אשׁר, what was born to him. The passive stands impersonally instead of the more definite active, "to whom one bore," so that the following names are subordinated to it with את. The third person singular Niph. occurs thus also in 1-Chronicles 3:4 and 1-Chronicles 26:6; the construction of Niph. with את frequently (Genesis 4:18; Genesis 21:5, and elsewhere). Ram is called, in the genealogy in Matthew 1:3-4, Aram; comp. רם, Job 32:2, with ארם, Genesis 22:21. כּלוּבי is called afterwards כּלב; cf. on 1-Chronicles 2:18.