折疑論 1.156

1.156

以號稱之。故名曰佛。猶三皇之與五帝。稱號而不稱姓也（三皇者。伏羲神農軒轅也。五帝者。少昊顓頊高辛唐堯虞舜也。皆有姓名而唯稱號）。

He is addressed by his epithet, and therefore named 'Buddha'. This is just like the Three Sovereigns and the Five Thearchs, who are called by their epithets and not by their surnames. (The Three Sovereigns are Fuxi, Shennong, and Xuanyuan. The Five Thearchs are Shaohao, Zhuanxu, Gaoxin, Tang Yao, and Yu Shun. All of them had surnames and personal names, but are only addressed by their epithets.)