Al-Ḥajjāj ibn Yūsuf ibn Maṭar (786-833), translated Euclid's Elements into Arabic
Sidi Hajjaj is a small town and rural commune in Settat Province of the Chaouia-Ouardigha region of Morocco.
Sidi Hajjaj Oued Hassar is a small town and rural commune in Kénitra Province of the Grand Casablanca region of Morocco.