Ramban on Shemos 2:16

English: NOW THE PRIEST OF MIDIAN HAD SEVEN DAUGHTERS. Scripture does not mention him by name for he is not known [to the reader], but rather epithetically mentions that he was the honored one in his priesthood. This was Jethro, for after he became related to Moshe it is written, And Moshe went and returned to Jether his father-in-law , 93 Further, 4:18. and there it is written, And Jethro said to Moshe: Go in peace . 93 Further, 4:18. [This proves that Jether and Jethro are the same person], just as Eliyah and Eliyahu, 94 Eliyah (II Kings 1:3), Eliyahu (I Kings 17:1). Yirmiyah and Yirmiyahu. 95 Yirmiyah (Jeremiah 27:1), Yirmiyahu ( ibid. , 1:1). After he became a proselyte to Judaism, he was called Hobab, as it is written, from the children of Hobab the father-in-law of Moshe , 96 Judges 4:11. for it is the way of all who become converts to Judaism that they be called another name in Israel. And he [Jethro or Hobab] was the son of Reuel, for it is written, And Moshe said unto Hobab, the son of Reuel the Midianite . 97 Numbers 10:29. The verse here stating, And they came to Reuel their father , 98 Verse 18. means “their father’s father,” just as [Jacob had said], O Hashem of my father Abraham