And it came to pass after this, that the king of the children of Ammon died, and Hanun his son reigned in his stead.

And it came to pass after this, that the king of the children of Ammon died, and Hanon his son reigned in his stead.

And it cometh to pass afterwards, that the king of the Bene-Ammon dieth, and Hanun his son reigneth in his stead,

Now after this, death came to the king of the children of Ammon, and Hanun, his son, became king in his place.

Now after these things, it happened that the king of the sons of Ammon died, and his son Hanun reigned after him.

The king - In marginal reference. Nahash, king, etc. The interval between the two events, not less than 50 years, and possibly more, is against his being the same as the Nahash of 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 - The equivalent of the Carthaginian Hanno, from the same root as the Hebrew, Hananiah, Johanan, Hannah, etc. The same name appears in composition with Baal in Baal-Hanan, an Aramean king Genesis 36:38-39.

And it came to pass after this,.... After the wars with the Moabites, Syrians, and Edomites, being friendly with the children of Ammon, David sent an embassy to their king, after related; by which it appears what is said concerning the spoils of the children of Ammon, 2-Samuel 8:12, is by anticipation; for these spoils were not taken until the following war with them, the occasion of which is here told:
that the king of the children of Ammon died; whose name was Nahash, as is clear from 2-Samuel 10:2, and probably might be the same that came against Jabeshgilead, from whom Saul delivered the inhabitants of that place, 1-Samuel 11:1,
and Hanun his son reigned in his stead; who, being his son, was heir to his crown, and succeeded him in his kingdom.

Nahash had been an enemy to Israel, yet had showed kindness to David. David therefore resolves gratefully to return it. If a Pharisee gives alms in pride, though God will not reward it, yet he that receives the alms ought to return thanks for it. Those who bear ill-will to their neighbours, are resolved not to believe that their neighbours bear any good-will to them. There is nothing so well meant, but it may be ill interpreted, and is wont to be so, by men who love nobody but themselves. The best men must not think it strange if they are thus misrepresented. Charity thinketh no evil. According to the usages of those days and countries, Hanun treated David's ambassadors in the most contemptuous manner. David showed much concern for his servants. Let us learn not to lay unjust reproaches to heart; they will wear off, and turn only to the shame of those who utter or do them; while the reputation wrongfully hurt in a little time grows again, as these beards did. God will bring forth thy righteousness as the light, therefore wait patiently for him, Psalm 37:6, Psalm 37:7.

This war, the occasion and early success of which are described in the present chapter and the parallel passage in 1 Chron 19, was the fiercest struggle, and, so far as the Israelitish kingdom of God was concerned, the most dangerous, that it ever had to sustain during the reign of David. The amount of distress which fell upon Israel in consequence of this war, and still more because the first successful battles with the Syrians of the south were no sooner over than the Edomites invaded the land, and went about plundering and devastating, in the hope of destroying the people of God, is shown very clearly in the two psalms which date from this period (the 44th and 60th), in which a pious Korahite and David himself pour out their lamentations before the Lord on account of the distress of their nation, and pray for His assistance; and not less clearly in Ps 68, in which David foretels the victory of the God of Israel over all the hostile powers of the world.