John Gill Commentary Genesis 46:13

"And the sons of Issachar: Tola, and Puvah, and Iob, and Shimron." — Genesis 46:13 (ASV)

And the sons of Issachar, Tola, and Phuvah; and Job, and
Shimron.
The first of these was the father of a numerous race in the days of David, their number was 22,600; (See Gill on 1 Chronicles 7:2); the second is called Puah, and the third Jashub, and the fourth Shimrom, (1 Chronicles 7:1) ; and were all the heads of families, as appears from the places referred to.