Wikipedia speaks of "the World Turtle in Hindu mythology ... known as Akupāra, or sometimes Chukwa." Wikipedia notes that "The British philosopher John Locke made reference to this in his 1689 tract, An Essay Concerning Human Understanding."
Brewer's Dictionary of Phrase and Fable lists, without citation, Maha–pudma and Chukwa as names from a "popular rendition of a Hindu myth in which the tortoise Chukwa supports the elephant Maha–pudma, which in turn supports the world".
Wikipedia also has a drawing, which it dates to 1876, of "the world supported on the backs of four elephants, themselves resting on the back of a turtle." Even closer to the Discworld scenario!
In the Discworld universe, the four elephants that stand on the back of Great A'Tuin and support the Discworld are named Berilia, Tubul, Great T'Phon, and Jerakeen.
© Haydn Thompson 2019