Genesis 19:36 Thus were both the daughters of Lot with child by their father. 37 And the firstborn bare a son, and called his name Moab: the same is the father of the Moabites unto this day.
We may take it that Ruth was a descendant of Lot through Moab, but there is no genealogy given for Moab or Ruth.
Ruth 1:1 Now it came to pass in the days when the judges ruled, that there was a famine in the land. And a certain man of Bethlehemjudah went to sojourn in the country of Moab, he, and his wife, and his two sons. 2 And the name of the man was Elimelech, and the name of his wife Naomi, and the name of his two sons Mahlon and Chilion, Ephrathites of Bethlehemjudah. And they came into the country of Moab, and continued there. 4 And they took them wives of the women of Moab; the name of the one was Orpah, and the name of the other Ruth: and they dwelled there about ten years.
From Easton’s Bible Dictionary:
A Moabitess, the wife of Mahlon, whose father, Elimelech, had settled in the land of Moab.
On the death of Elimelech and Mahlon, Naomi came with Ruth, her daughter-in-law, who refused to leave her, to Bethlehem, the old home from which Elimelech had migrated.
There she had a rich relative, Boaz, to whom Ruth was eventually married.
She became the mother of Obed, the grandfather of David.
Thus Ruth, a Gentile, is among the maternal progenitors of our Lord #Mt 1:5. The story of "the gleaner Ruth illustrates the friendly relations between the good Boaz and his reapers, the Jewish land system, the method of transferring property from one person to another, the working of the Mosaic law for the relief of distressed and ruined families; but, above all, handing down the unselfishness, the brave love, the unshaken trustfulness of her who, though not of the chosen race, was, like the Canaanitess Tamar #Ge 38:29 Mt 1:3 and the Canaanitess Rahab #Mt 1:5 privileged to become the ancestress of David, and so of ‘great David’s greater Son’" #Ru 4:18-22.
I hope you find this helpful.