According to 1 Chronicles 11:4, what was Jerusalem called when the Jebusites lived there?

Answer: Jebus

David and all Israel marched to Jerusalem, "that is, Jebus," and captured the fortress of Zion, the City of David.

“Then David and all the Israelites marched to Jerusalem (that is, Jebus), where the Jebusites inhabited the land. The people of Jebus said to David, “You will never get in here.” Nevertheless, David captured the fortress of Zion (that is, the City of David).”— 1 Chronicles 11:4-5 (BSB)