Numbers 26:24

Of Jashub, the family of the Jashubites: of Shimron, the family of the Shimronites.

Cross-reference

Genesis 46:13 lists Jashub (as Job) and Shimron among Issachar's sons who entered Egypt—parallel genealogy.

1 Chronicles 7:1 again gives Jashub and Shimron as sons of Issachar, matching the clan names here.