Why was Al-Azhar named after Fatimah al-Zahra?

Al-Azhar was named after Fatimah al-Zahra, the daughter of the Prophet Muhammad, to honor the ancestor from whom the Fatimid dynasty claimed descent.123

The name "al-Zahra" means "the Luminous" or "the Resplendent". When the Fatimids established Cairo as their capital in the 10th century, they built the mosque and seminary of Al-Azhar at its center, naming it in recognition of this significant lineage, which was central to their identity as Ismaili Shi'i imams and their claim to the caliphate.231