Lisa Olivia Munn was born in Oklahoma City July 3, 1980 to Kimberly (née Nguyen) and Winston Munn. Her father is of German, Irish, and English ancestry while her mother is from Vietnam of Chinese descent. Her mother fled to the United States as a Vietnamese refugee in 1975 after the Vietnam War, and settled in Oklahoma where she met Munn's father. Munn has one younger brother, John, a physicist; one older brother, James, a custom motorcycle shop owner; and two older sisters, Annie and Sara, the latter of whom is a lawyer.