John Gill Reformed Baptist @doctorgill

And Nebo, and Baalmeon, (their names being changed,).... For Nebo was the name of an idol, after which perhaps the city was called: Baalmeon signifies "Baal's habitation", and where it is highly probable was a temple of his; and the children of Reuben, not liking to retain such idolatrous names, gave them others, but what they were it is not said; and certain it is...

Keil & Delitzsch Lutheran @keilanddelitzsch

Num 32:37-38 The Reubenites built Heshbon, the capital of king Sihon (see Num 21:16), which was allotted to the tribe of Reuben (Jos 13:17), but relinquished to the Gadites, because it was situated upon the border of their territory, and given up by them to the Levites (Jos 21:39; 1Ch 6:66).

Commenting on Numbers 32:37-38