Exposition of the Old and New Testament, by John Gill, [1746-63], at sacred-texts.com
This book is called Ruth, not because she was the author of it, but because she is the principal subject of it. In the Syriac and Arabic versions, it is called the Book of Ruth the Moabitess, which describes her by the country of which she was. Her name, according to Hillerus (l), signifies beautiful, of a good aspect, the same with Calliope in Greek. As to the author of this book, some attribute it to Eli the priest, who seems to have been too soon to give an account of the birth of David; others to Gad or Nathan; some to Hezekiah, and others to Ezra; but what the Talmudists assert, which is most generally received, and most probable, is, that it was written by Samuel; so they say Samuel (m) wrote his own book, Judges, and Ruth; and it is commonly said that this book is an appendix to that of the Judges, and the introduction to Samuel, and is fitly placed between them both. According to Eusebius (n), with the Hebrews, Judges and Ruth make one book they call Shophetim, or Judges; the principal design of it is to give the genealogy of David, whom Samuel had anointed to be king of Israel, and from whom the Messiah was to come, and who therefore may be said to be the aim and scope of it, as he is of all Scripture; and whereby it appears that he sprung both from Jews and Gentiles, and is the Saviour of both, and there is a good foundation for both to hope in him; and the call and conversion of Ruth the Moabitess may be considered as a shadow, emblem, and pledge of the conversion of the Gentiles. Manythings besides may be learnt from this little book, as the different circumstances of good people in this life, and the particular providence of God respecting them. It furnishes out examples of bearing afflictions patiently, of industry, courteousness, kindness to strangers, and young converts; and none can doubt of the divine authority of this book, that considers the use made of it in the genealogies of Christ by the Evangelists Matthew and Luke.
(l) Onomastic. Sacr. p. 211. (m) T. Bab. Bava Bathra, fol. 13. 2. (n) Eccl. Hist. 1. 6. c. 25.