וַתֵּ֤לֶד הַבְּכִירָה֙ בֵּ֔ן וַתִּקְרָ֥א שְׁמ֖וֹ מוֹאָ֑ב ה֥וּא אֲבִֽי־מוֹאָ֖ב עַד־הַיּֽוֹם׃
And the first-born bore a son, and called his name Moab—the same is the father of the Moabites unto this day.
Read kabbalistic (mystical) interpretation of Genesis 19:37: and classical mystical sources.