Tjuyu
Tjuyu( sometimes transliterated as Thuya or Thuyu) was an Egyptian noblewoman and the mother of queen Tiye, and the wife of Yuya.
She is the grandmother of Akhenaten, and great grandmother of Tutankhamun.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
Hüma Hatun
Hüma Hatun (1410 ‒ September 1449) was the fourth wife of Ottoman Sultan Murad II and mother of Mehmed II and the grandmother of Bayezid II.
Mona Hopton Bell
Mona Hopton Bell( 1867- 1940) was a British artist, best known for her portraits of civic figures.
She was the grandmother of the painter Jean H. Bell.
Hubba bint Hulail
Hubba bint Hulail was the grandmother of Hashim ibn' Abd Manaf, thus the great- great- great- grandmother of the Islamic" Nabī"( Prophet) Muhammad ibn Abdullah.
Anne Denman
Anne Denman( 1587–1661) was born in Olde Hall, Retford, Nottinghamshire.
Through a fortunate second marriage with Thomas Aylesbury, she became the grandmother of Lady Anne Hyde, Duchess of York and great- grandmother of Queen Mary II and Queen Anne.
Carrie Fisher
Carrie Frances Fisher (October 21, 1956 – December 27, 2016) was an American actress, writer, and comedian.
Fisher is best known for playing Princess Leia in the "Star Wars" films, a role for which she was nominated for four Saturn Awards.
Her other film credits include "Shampoo" (1975),
"The Blues Brothers" (1980), "Hannah and Her Sisters" (1986), "The 'Burbs" (1989), "
When Harry Met Sally..." (1989), "Soapdish" (1991), and
"The Women" (2008).
She was nominated twice for the Primetime Emmy Award for Outstanding Guest Actress in a Comedy Series for her performances on the television series "30 Rock" and "Catastrophe".
She was posthumously made a Disney Legend in 2017, and in 2018 she was awarded a posthumous Grammy Award for Best Spoken Word Album.
Fisher wrote several semi-autobiographical novels, including "Postcards from the Edge" and an autobiographical one-woman play, and its non-fiction book, "Wishful Drinking", based on the play.
She wrote the screenplay for the film version of "Postcards From The Edge" which garnered her a BAFTA Award for Best Adapted Screenplay nomination, and her one-woman stage show of "Wishful Drinking" was filmed for television and received a nomination for the Primetime Emmy Award for Outstanding Variety Special.
She worked on other writers' screenplays as a script doctor, including tightening the scripts for "Hook" (1991), "Sister Act" (1992),
"The Wedding Singer" (1998), and many of the films from the "Star Wars" franchise, among others.
In later years, she earned praise for speaking publicly about her experiences with bipolar disorder and drug addiction.
Fisher was the daughter of singer Eddie Fisher and actress Debbie Reynolds.
She and her mother appear in , a documentary about their relationship.
It premiered at the 2016 Cannes Film Festival.
Fisher died of a sudden cardiac arrest on December 27, 2016, at age 60, four days after experiencing a medical emergency during a transatlantic flight from London to Los Angeles.
One of her final films, , was released on December 15, 2017, and is dedicated to her.
Fisher appeared in  through the use of unreleased footage from "The Force Awakens".
Kaoru Hatoyama
After the elections of 2009, she became more widely known as the grandmother of Prime Minister Yukio Hatoyama and his politician brother Kunio Hatoyama.
Gülbahar Hatun (wife of Mehmed II)
Gülbahar Hatun( 1432 – 1492) was the consort of Sultan Mehmed II, and mother of Sultan Bayezid II of the Ottoman Empire and the grandmother of Selim I.
Billie Lourd
Billie Catherine Lourd (born July 17, 1992) is an American actress.
She is known for starring as Chanel #3 in the Fox horror comedy series "
Scream Queens" (2015–2016) and for her roles in the FX horror anthology series "American Horror Story" (2017–present).
She also appears as Lieutenant Connix in the "Star Wars" sequel trilogy (2015–2019).
Lourd is the only child of actress Carrie Fisher.

Question: Who is the maternal grandmother of Billie Lourd?
Answer: Debbie Reynolds