史东 is a Taiwanese / older mainland transliteration of the surname Stone, treating it more like a Chinese-style two-character name (
史 = a real Chinese surname,
东 = east). The standard PRC rendering today is
斯通 (Sītōng) — see for instance Oliver Stone (
奥利弗·
斯通) and Emma Stone (
艾玛·
斯通).