The sons of Ulam were men who were mighty warriors, bowmen, having many sons and grandsons, 150. All these were Benjaminites.
It is observable that among all the genealogies of the tribes there is no mention of any of the kings of Israel after the defection from the house of David, much less of their families; not a word of Jeroboam's house or Baasha's, of Umri's or Jehu's; for they were all idolaters.
Commenting on 1 Chronicles 8:33-40
mighty men of valour, archers--(see on Jdg 20:16). Great strength as well as skill was requisite in ancient archery, as the bow, which was of steel, was bent by treading with the feet, and pulling the string with both hands. Next: 1 Chronicles Chapter 9
The sons of Ulam were mighty men of valor - The Targum speaks honourably of them: "The sons of Ulam were mighty and strong men, subduing by wisdom their evil concupiscence, as men bend a bow; therefore they had many sons and grandsons." Of the six sons of Azel, mentioned Ch1 8:38, R. S. Jarchi says that their allegorical expositions were sufficient to load thirteen thousand camels!