John Gill Commentary 1 Chronicles 7:12

"Shuppim also, and Huppim, the sons of Ir, Hushim, the sons of Aher." — 1 Chronicles 7:12 (ASV)

Shuppim also, and Huppim, the children of Ir
The same with Iri, (1 Chronicles 7:7) so that these were not sons of Benjamin, as they seem to be, if they are the same with Muppim and Huppim in (Genesis 46:21) but his great-grandchildren, and are the same with Shupham and Hupham, from whom families of the tribe of Benjamin sprung, (Numbers 26:39) the Targum calls them the inhabitants of a city, but of what is not said, unless Geba should be meant, (1 Chronicles 8:6) and

Hushim, the sons of Aher :
either the same with Aharah, the third son of Benjamin, (1 Chronicles 8:1) or Ahiram, (Numbers 26:38) , though some read the words, "the sons of another"; whom they suppose to be Dan, who otherwise is omitted; and Hushim is the only son of Dan, (Genesis 46:23) , where the same plural word is used as here; who, they think, is called another, by way of detestation, that tribe being guilty of gross idolatry; but he rather seems to belong to Benjamin.