Which palace steward was rebuked in Isaiah 22 for carving out a tomb for himself?

Answer: Shebna

The LORD sent Isaiah to Shebna, the steward in charge of the palace, asking who authorized him to chisel a tomb for himself in the rock.

“This is what the Lord GOD of Hosts says: “Go, say to Shebna, the steward in charge of the palace: What are you doing here, and who authorized you to carve out a tomb for yourself here—to chisel your tomb in the height and cut your resting place in the rock?”— Isaiah 22:15-16 (BSB)