The Hebrew word for Champion, rav, typically means “chief” or “captain” and, as an adjective, can mean “great” (as in the word “rabbi,” “my great one”).
Champion in Hebrew:
Strong’s Concordance number: 7227b
Bible reference: Isa. 19:20
In that day there will be an altar to the Lord in the midst of the land of Egypt, and a pillar to the Lord near its border. It will become a sign and a witness to the Lord of hosts in the land of Egypt; for they will cry to the Lord because of oppressors, and He will send them a Savior and a Champion, and He will deliver them. (Isaiah 19:19-20)
There are other versions of this name in English Bibles (Defender NIV, Great One KJV).
Jeremiah 20:11 likens God to a “dread champion” (gibbor), but the word is not used as a title or name of God.