The most famous persons on earth are Biblical, historical and political figures. Nobody really uses these entertainers and celebrities aside from pop fans.
if we're including fictional characters then maybe jesus christ i guess
Tacitus, Flavius Josephus, Julius Africanus, Pliny the Younger, Lucian of Samosata, Mara Bar-Serapion, Babylonian Talmud, and Eliezar were some of the many historians of the ancient world that attested Jesus' existence.