一切經音義 26.145

26.145

天竺（或云身毒亦云賢豆皆訛也正云印度此云月也月有千名斯一稱也良以彼土賢聖相繼開悟群生照臨如月也又云賢豆本名天帝當以天帝所護故世允號之）。

Tianzhu [天竺, India] (sometimes called Yuandu [身毒], or Xiandou [賢豆]; all are corrupt forms; the correct name is Indu [印度], translated here as "Moon"; the moon has a thousand names, and this is one designation. This is because in that land sages have succeeded one another, awakening sentient beings and illuminating them like the moon. Alternatively, it is said that Xiandou was originally the name of the Heavenly Lord [Indra], and because the land is protected by the Heavenly Lord, the world accordingly named it after him).