Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Ruaidrí Ua Conchobair
Ruaidrí Ua Conchobair (Modern Irish:
Ruaidhrí Ó Conchobhair, or, Ruairí Ó Conchúir; commonly anglicised as Rory O'Connor or Roderic O'Connor)
(– 2 December 1198) was King of Connacht from 1156 to 1186, and High King of Ireland from 1166 to 1193.
He was the last High King of Ireland before the Norman invasion (Brian Ua Néill and Edward Bruce both claimed the title with opposition in later years).
Ruaidrí was one of over twenty sons of King Tairrdelbach Ua Conchobair (1088–1156).
He and his sister Mór were Tairrdelbach's only children from his third wife, Cailech Dé Ní hEidin of Aidhne.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
Muirghis Cananach Ua Conchobhair
Muirghis Cananach Ua Conchobhair, Prince of Connacht, died 1224.
Muirghis was one of the children of the last Gaelic King of Ireland, Ruaidrí Ua Conchobair.
He became a monk and was a noted poet and singer.
His death is noted in the Annals of Lough Ce:
"'
Muirghes Cananach, son of Ruaidhri O'Conchobhair, the most expert man that ever came of the Gaeidhel in reading, and in psalm-singing, and in versemaking, died in this year, and was interred in Cunga-Feichin (Cong), after the triumph of unction and penitence."
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.
Brian Luighnech Ua Conchobhair
Brian Luighneach Ua Conchobhair, Prince of Connacht, died 23 May 1181.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Henry Krause
Henry J." Red" Krause, Jr.( August 28, 1913 – February 20, 1987) was an American football offensive lineman in the National Football League for the Brooklyn Dodgers and the Washington Redskins.
He played college football at St. Louis University.
He is the grandfather of Jennifer Krause
He is the great grandfather of Payton Hoeing
Fred Le Deux
Frederick" Fred" Le Deux( born 4 December 1934) was an Australian rules footballer who played with Geelong in the Victorian Football League( VFL).
He is the grandfather of Tom Hawkins.
Áed in Gai Bernaig
Áed Ua Conchobair or Áed in Gai Bernaig was King of Connacht, and reigned 1046 – 1067.
King Art of Connacht was killed by the Cinel- Conaill in 1046, the second year after his having plundered Cluain- mic- Nois.
" M1061.12- The Muintir- Murchadha invaded Loch Oirbsean, and deposed Aedh Ua Conchobhair.
The victory of Gleann- Phadraig was gained by Aedh Ua Conchobhair over the people of West Connacht, where many were slain, together with Ruaidhrí.
Ó Flaithbheartaigh, lord of West Connacht, was beheaded, and his head was carried to Cruachain in Connacht, after the son of Aedh, son of Ruaidhri, had been defeated."
" M1062.5- Tadhg, son of Aedh Ua Conchobhair, was slain by the son of Aedh, son of Ruaidhrí, and the people of West Connacht."

Question: Who is the paternal grandfather of Muirghis Cananach Ua Conchobhair?
Answer: Tairrdelbach Ua Conchobair