 Born Margot Louise Hemingway in Portland, Oregon, she was the daughter of Byra Louise (née Whittlesey) and Jack Hemingway (eldest son of writer Ernest Hemingway).When she learned that she was named after the wine, Château Margaux, which her parents drank on the night she was conceived, she changed the spelling from "Margot" to "Margaux" to match.She had two sisters, actress Mariel Hemingway, and Joan (nicknamed Muffet).