Aha bar Jacob stated that the breastplate of the High Priest of Israel contained the Hebrew words "The tribes of Jeshurun," thus supplying the otherwise missing Hebrew letter teth in the word "Shivtei" ("tribes").
In the Chassidic discourses of the Baal Shem Tov and his students, the word Yeshurun is suggested to come from the root "shir," meaning song or ring.
The Reformer John Calvin reflected that "by using the word 'upright' for Israel, [the author] ironically taunts them with having departed from rectitude, and, reminding them of the high dignity conferred upon them, more severely reproves their sin of unfaithfulness".
[3] Nineteenth century theologian Charles H. Waller argued that "Jeshurun is a diminutive—a term of endearment: either 'the child of the upright', or 'the beloved Israel'".
[4] However, Joseph Benson noted that "some consider the word as being derived from שׁור, shur, to see, and think the appellation was given them because they were so highly favoured with divine manifestations".