The younger also bore a son and called his name Ben-ammi. He is the father of the Ammonites to this day.
Here is, I. The great trouble and distress that Lot was brought into after his deliverance, Gen 19:30. 1. He was frightened out of Zoar, durst not dwell there; probably because he was conscious to himself that it was a refuge of his own choosing and that herein he had foolishly prescribed to God, and therefore he could not but distrust his safety in it...
Commenting on Genesis 19:30-38
And the younger, she also bare a son, and called his name Benammi: the same [is] the father of the children of Ammon unto this day. (t) That is, son of my people: signifying that they rejoiced in their sin, rather than repenting of it.
Ben-ammi - בן עמי Ben-ammi, the son of my people. Both these names seem to justify the view taken of this subject above, viz., that it was merely to preserve the family that the daughters of Lot made use of the above expedient; and hence we do not find that they ever attempted to repeat it, which, had it been done for any other purpose...