Genesis 19:37-38

Young's Literal Translation

³⁷ and the first-born beareth a son, and calleth his name Moab; he [is] father of Moab unto this day;

³⁸ as to the younger, she also hath born a son, and calleth his name Ben-Ammi: he [is] father of the Beni-Ammon unto this day.