漢譯"天主"的歷史 後來洋人發現中國有天主 地主 山主
他很合理地懷疑 "帝/主" 的發音與Deus/Zeus/Deva等自發音類似 可能相關
Deus (Latin pronunciation: [ˈdeːʊs]) is Latin for "god" or "deity". Latin deus and dīvus "divine", are descended from Proto-Indo-European *deiwos, from the same root as *Dyēus, the reconstructed chief god of the Proto-Indo-European pantheon. Compare Greek Zeus (Ζεύς, pronounced zdeús), in Aeolic Greek Δεύς (deús).
In Classical Latin it was a general noun referring to any divine figure. In Late Latin, it came to be used mostly of the Christian God. It is inherited directly in the Romance languages, as French dieu, Spanish dios, Portuguese deus, Italian dio, etc.
In ancient Sanskrit, the word used for 'God' or a deity is Dev, Deva, or Devta (देव/देवता) which also means "[He/She] who gives or provides".  'Dev' is a very commonly used word and also can be used for anything Divine or of God.  Many etymologists believe that the Sanskrit word 'Dev' is the root of Deus.