Gigi Edgley is an Australian actress, singer and songwriter. She is best known for her roles as Chiana on the series Farscape and Lara Knight in Rescue: Special Ops. In her case, I think Gigi isn't a nickname for anything.
Gigi D'Agostino is a male Italian DJ who was huge in the 90's for songs like "L'amour Toujours" and "Bla Bla Bla". His real first name is Luigino though.
Gigi Loren Lazzarato, better known as Gigi Gorgeous, is a Canadian model, actress, and internet personality. She is noted for publicly coming out as a transgender woman, and maintaining her public image and YouTube channel during and after her transition. Along with being an internet personality, Lazzarato has also appeared on a number of television shows including Access Hollywood, Good Work, and Project Runway: All Stars, along with starring as herself in the popular online reality show The Avenue for three years.
Gigi is the name of the black cat on Kiki's Delivery Service. He is hilarious. And yeah it's a girl's name, but it's a Japanese show so it could mean something else to them.
There is a character in Lemony Snicket's A Series of Unfortunate Events whose full name is Esmé Gigi Genevieve Squalor. She is vile and greedy.
― Anonymous User 7/13/2006
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Gigi is a novel by the French writer Colette about a wealthy man who discovers that he is in love with a young Parisian girl who is being groomed for a career as a courtesan, and eventually marries her. It has been made into several plays and films.