Hippolyte Le Sorcier is a character created by H. P. Lovecraft, who included him in the family tree of Azathoth in a 1933 letter to James F. Morton. Le Sorcier is depicted as a son or descendant of "Gilles Grenier, Lord of Averoigne", and an ancestor of Lovecraft's friend Clark Ashton Smith.
It's unknown if Lovecraft intended this character to be related to Charles Le Sorcier, the titular villain from his short story "The Alchemist". In French, "Le Sorcier" means "The Sorcerer", most likely intended as an epithet, as opposed to a surname. In "The Alchemist", Charles Le Sorcier is the son of Michel Mauvais ("mauvais" being a French word for bad or evil), and is specifically noted to have no known descendants.