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.