Albert Barnes Commentary 2 Samuel 10:1

"And it came to pass after this, that the king of the children of Ammon died, and Hanun his son reigned in his stead." — 2 Samuel 10:1 (ASV)

The king — The marginal reference identifies this king as Nahash. However, the interval between the two events, which is at least 50 years and possibly more, makes it unlikely that he is the same Nahash mentioned in 1 Samuel 11:1–15.

The Ammonites are almost always spoken of as the "children of Ammon," from the name of their first ancestor, Ben-ammi (Genesis 19:38).

Hanun — This name is the equivalent of the Carthaginian Hanno and comes from the same root as the Hebrew names Hananiah, Johanan, and Hannah. The same name appears in composition with Baal in Baal-hanan, an Aramean king mentioned in Genesis 36:38–39.