Jerub-baal means he fights or will fight-Baal. It may be understood in two ways: Baal fights, or he fights Baal. The villagers mean: Baal will fight him, namely Gideon. In the story, however, the other meaning is also implied or at least suggested: Gideon is the one who fights Baal, as he did by breaking down his altar.
32 Et en ce jour l'on donna à Gédéon le nom de Jerubbaal, en disant: Que Baal plaide contre lui, puisqu'il a renversé son autel.