Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
Fujiwara no Nagara
, also known as Fujiwara no Nagayoshi, was a Japanese statesman, courtier and politician of the early Heian period.
He was the grandfather of Emperor Yōzei.
Ismail Samani
Abū Ibrāhīm Ismā'īl ibn Aḥmad (May 849 – 24 November 907), better simply known as Ismail Samani , and also known as Isma'il ibn Ahmad , was the Samanid amir of Transoxiana (892–907) and Khorasan (900–907).
His reign saw the emergence of the Samanids as a powerful force.
He was the son of Ahmad ibn Asad and a descendant of Saman Khuda, the eponymous ancestor of the Samanid dynasty who renounced Zoroastrianism and embraced Islam.
Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.
Prithvipati Shah
Prithvipati Shah( ?–1716) was the king of the Gorkha Kingdom in the Indian subcontinent, present- day Nepal.
He was the grandfather of Nara Bhupal Shah.
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
Abu Salih Mansur
Abu Salih Mansur( died 915) was a Samanid prince, who served as governor during the reign of his uncle Isma'il ibn Ahmad, his cousin Ahmad Samani, and Nasr II.
Ahmad Samani
Ahmad ibn Ismail (died 24 January 914) was amir of the Samanids (907–914).
He was the son of Ismail Samani.
He was known as the Martyred Amir.

Question: Who is the paternal grandfather of Ahmad Samani?
Answer: Ahmad ibn Asad