Shuppim
Two men named Shuppim appear in 1 Chronicles. The first is the son of Ir in the Benjaminite (or Manassite) genealogy, where he is named twice in close succession alongside his brother Huppim. The second is a Levite gatekeeper in David's temple-service rotation.
Son of Ir
Shuppim shows up first inside the genealogy of chapter 7: "Shuppim also, and Huppim, the sons of Ir; Hushim, the son of another" (1Ch 7:12). A few verses later he is named again, this time in connection with the Manassite Machir: "And Machir took a wife of Huppim and Shuppim, whose sister's name was Maacah; and the name of the second was Zelophehad: and Zelophehad had daughters" (1Ch 7:15). The Huppim-and-Shuppim pair therefore stands at the seam between two tribal lines, with Machir marrying into their clan and Zelophehad — the man whose daughters force the inheritance ruling — surfacing in the same paragraph.
The Levite Gatekeeper
The other Shuppim is one of the gatekeepers assigned to a station of the temple under David's roster: "To Shuppim and Hosah westward, by the gate of Shallecheth, at the causeway that goes up, watch against watch" (1Ch 26:16). Shuppim and Hosah hold the western post — at the Shallecheth gate, on the causeway that climbs up to the sanctuary — in the watch-against-watch rotation that organizes the Levitical guard.