Abu al-Qasim al-Tabarani: Hakim had sons: Abdullah, Khalid, Yahya, and Hisham. They all met the Prophet, peace and blessings be upon him, and embraced Islam on the day of the conquest of Mecca.
Ibn Hajar al-Asqalani: His hadith is narrated by Bakir ibn al-Ashj, from his father, from the Prophet, peace and blessings be upon him. This is why Ibn Hibban and others mentioned him among the followers.
Hisham ibn al-Sa'ib al-Kalbi: He embraced Islam on the day of the conquest of Mecca.
Yahya ibn Ma'in: Trustworthy