Her father, Charles Clark, died when Eugenie was almost two years old, and her mother, Yumico Motomi, later married Japanese restaurant owner Masatomo Nobu.
Ayahnya, Charles Clark, meninggal ketika Clark Eugenie masih berusia dua tahun, dan ibunya, Yumico Motomi, nantinya menikahi pemilik restoran jepang Masatomo Nobu.