Why does it say "Bnei Hashem"? Only one is listed!
Rashi 1 (Shmuel II, 23:39): Perhaps there were another two or three [not named, to complete the count of 37 in 23:39].
Radak: We find like this ? "u'Vnei Falu Eli'av" (Bamidbar 26:8), "u'Vnei Chushim Dan" (Bereishis 46:23).
Rashi discusses "Bnei Yashan." The same answer can apply here. It is difficult to say that ha'Gizoni and Yonason were both "Bnei Hashem", for there is no prefix Vov before Yonason. (Some editions have a Parshah break in between.) The Ta'amim (notes) imply that our verse means that Bnei Hashem ha'Gizoni was Yonason. (Perhaps this is the same as Bnei Yashan there; there, his son is called Yehonason. We find that Yonason ben Sha'ul was called also Yehonason.) (PF)
