Name: Hazrat Sa’d bin Abi Waqqaas (radhiyallahu ‘anhu)
Kunyah (agnomen): Abu Ishaaq (Siyar A’laam min Nubalaa vol 3 pg. 58)
Father’s Name: Maalik bin Wuhaib bin ‘Abd Manaaf (Tabaqaat ibn Sa’d vol 3 pg. 101)
Mother’s Name: Hamnah bint Sufyaan bin Umayyah bin ‘Abd Shams (Tabaqaat ibn Sa’d vol 3 pg. 101)
Title: Faaris-ul-Islam (the Horseman of Islam) (Tahzeeb-ul-Kamaal vol. 10 pg. 310)
Islam:
Hazrat Sa’d (radhiyallahu ‘anhu) accepted Islam at the age of nineteen. (Istee‘aab vol. 2 pg. 171, Tahzeeb-ul-Kamaal vol. 10 pg. 311)
According to some narrations, Hazrat Sa’d (radhiyallahu ‘anhu) accepted Islam at the age of seventeen. (Siyar A’laam min Nubalaa vol. 3 pg. 61)
Family Ties with Rasulullah (sallallahu ‘alaihi wasallam):
Hazrat Jaabir bin ‘Abdillah (radhiyallahu ‘anhu) narrates that Hazrat Sa’d (radhiyallahu ‘anhu) once arrived when Rasulullah (sallallahu ‘alaihi wasallam) said, “This is my maternal uncle. Which person can show me a maternal uncle like mine.”
Note: Rasulullah (sallallahu ‘alaihi wasallam) referred to Hazrat Sa’d (radhiyallahu ‘anhu) as his maternal uncle (despite him not being the brother of Nabi (sallallahu ‘alaihi wasallam)’s respected mother) because Hazrat Sa’d (radhiyallahu ‘anhu) hailed from the Banu Zuhrah tribe and the respected mother of Rasulullah (sallallahu ‘alaihi wasallam), Hazrat Aaminah, also hailed from the Banu Zuhrah tribe.
(Sunan Tirmizi #3752)
Source: Whatisislam.co.za