The Shuppites and Huppites were descendants of Ir, and the Hushites were descendants of Aher.
We have here a short view given us, I. Of the tribe of Issachar, whom Jacob had compared to a strong ass, couching between two burdens (Gen 49:14), an industrious tribe, that minded their country business very closely and rejoiced in their tents, Deu 33:18. And here it appears, 1. That they were a numerous tribe; for they had many wives.
Commenting on 1 Chronicles 7:1-19
And Machir took to wife the sister of Huppim and Shuppim, whose sister's name was Maachah,.... He married into the tribe of Benjamin, a sister of the persons mentioned, Ch1 7:12 whose name was Maachah: and the name of the second was Zelophehad; the second son of Manasseh, or of his posterity mentioned; for he was not his immediate son; for he was the son...
Shuppim also, and Huppim--They are called Muppim and Huppim (Gen 46:21) and Hupham and Shupham (Num 26:39). They were the children of Ir, or Iri (Ch1 7:7). and Hushim, the sons--"son." of Aher--"Aher" signifies "another," and some eminent critics, taking "Aher" as a common noun, render the passage thus, "and Hushim, another son." Shuppim, Muppim, and Hushim are plural words, and therefore denote not individuals...