Genesis 19:37 in the King James Version
And the firstborn bare a son, and called his name Moab: the same is the father of the Moabites unto this day.
Context
36 Thus both of Lot’s daughters were with child by their father.
37 The firstborn bore a son, and named him Moab. He is the father of the Moabites to this day.
38 The younger also bore a son, and called his name Ben Ammi. He is the father of the children of Ammon to this day.