Jebus

Jebus was the second name and also mentioned in the Bible. It was an old name of Jerusalem derived from the Jebusites who dwelt there during the time of king David. During this period the city was really Mount Zion, the chief hill (Judg. 19: 10; 1 Chron. 11:4, 5). Note: Even though the Jebusites referred to Jerusalem as Jebus, the Tell El Amarna Tablets shed light on the etymology of the very ancient name using the name "Urusaliyim" for Jerusalem.

Link: https://bible-history.com/jerusalem/overview