Umm Ḥakīm Al-Bayḍāʾ bint ʿAbd al-Muṭṭalib (Arabic: أم حكيم البيضاء بنت عبد المطلب) was an aunt of Muhammad and maternal grandmother of Uthman.
She was born in Mecca around 546, the daughter of Abd al-Muttalib and Fatima bint Amr al-Makhzumiya.
[1][2]: 32 She was the twin sister of Abdullah, the father of Muhammad.
[3]: 198 Umm Hakim was known as Al-Bayḍāʾ ("the White One") because she was Abd al-Muttalib's only fair-skinned daughter.
[3]: 198 She married Kurayz ibn Rabi'a from the Abd Shams clan of the Quraysh.