The Hebrew rendered “Lucifer” in the KJV is ‘helel’, lit. “daystar”, most likely referring to what we now know as the planet Venus, which rises in the morning. “Lucifer” is Latin for light-bearer and in the Vulgate, does not appear as a proper noun, rather, a common one. It appeared carried over to the KJV by the translators who referred to the Vulgate during the translation process.Look at Isaiah 14:12. “Lucifer” has been replaced by one of the names of Jesus, “Day Star,” “Son of the Dawn,” Morning Star."
Any takers on what the available Hebrew texts read here?
The immediate meaning and fulfilment of this prophecy is the fall of the king of Babylon, either Nebuchadnezzar II or the Empire in general. So in the original context and translations, this does not immediately refer to the fall of Satan.
This does not mean we cannot apply Christian concepts: we see in the Babylonian exile a representation of our own exile, brought about by Satan.
But overall, the rendering of Morning Star, Daystar, etc. for “helel” should not alarm anyone into thinking that modern Bibles equate Jesus with Satan.