Was the monarch of ancient Qi surnamed Jiang or Tian? Seek a detailed explanation

At first, the name of Qi State was Jiang. Later, Chen's son fled to Qi State. When he was born, the fortune teller of the Zhou Dynasty told him that he would achieve a high position, but it was not Chen's country, but Jiang's country, and his fifth grandson would be more expensive. Become the ancestor of Qi Guotian's surname. And his fifth grandson, Tian Heshi, was already very strong, so he exiled Qi Kanggong before the King of Zhou, and established himself as the King of Qi, which was called "the King of Qi in Shi Tian" in history.