Ruth in the bible was "of the women of Moab" but she was a descendant of Lot, the nephew of the partriarch Abraham.
This is seen in Ruth 1:4, Genesis 19:37 and Genesis 11:31.
Her first husband, father-in law, and her brother-in-law all died.
Later, she married Boaz and had a son whose name was Obed. The book of Ruth bears her name.