This is the abbreviation for the Greek word for Jesus. Sometimes the post on the H might be crossed indicating that it is an abbreviation. The name Jesus means "the Lord saves." Jesus is his personal name.
Matthew 1:21 She will give birth to a son and you are to give Him the name Jesus, because He will save His people from their sins.
Acts 4:12 Salvation is found in no one else, for there is no other name under heaven given to men by which we must be saved.