Therefore on that day he called him Jerubbaal, saying, Let Baal plead against him, because he hath thrown down his altar.
Therefore ... he called him - not Joash, but the people, so that it is equivalent to 'he was called.'
Jerubbaal i:e., with whom Baal contends; or Jerubbesheth (2 Samuel 11:21), i:e., with whom the idol contends [Septuagint, ekalesen auto Ierobaal, called it, namely, the altar, Jerubbaal].