"Lucifer" is not a proper name. The Hebrew terms behind it meant "son of the morning" or "morning star" but for whatever reason the Vulgate and King James Version of the Bible didn't translate the Hebrew terms but turned them into a proper name. Modern translations accurately state "morning star." In context, it is used of a man, the king of Babylon, and not some supernatural being. Jesus Himself is referred to as the morning star, in 2 Peter 1:19 and Revelation 22:16.
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