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http://www.lds-mormon.com/lucifer.shtml
Lucifer: Lucifer is a Latin name. So how did it find its way into a Hebrew manuscript, written before there was a Roman language?
In the original Hebrew text, the fourteenth chapter of Isaiah 14:12 is not about a fallen angel, but about a fallen Babylonian king, who during his lifetime had persecuted the children of Israel. It contains no mention of Satan, either by name or reference.
Why Lucifer? In Roman astronomy, Lucifer was the name given to the morning star (the star we now know by another Roman name, Venus). The morning star appears in the heavens just before dawn, heralding the rising sun. The name derives from the Latin term lucem ferre, bringer, or bearer, of light." In the Hebrew text the expression used to describe the Babylonian king before his death is Helal, son of Shahar, which can best be translated as "Day star, son of the Dawn." The name evokes the golden glitter of a proud king's dress and court (much as his personal splendor earned for King Louis XIV of France the appellation, "The Sun King").
The scholars authorized by ... King James I to translate the Bible into current English did not use the original Hebrew texts, but used versions translated ... largely by St. Jerome in the fourth century. Jerome had mistranslated the Hebraic metaphor, "Day star, son of the Dawn," as "Lucifer," and over the centuries a metamorphosis took place. Lucifer the morning star became a disobedient angel, cast out of heaven to rule eternally in hell.
So "Lucifer" is nothing more than an ancient Latin name for the morning star, the bringer of light. That can be confusing for Christians who identify Christ himself as the morning star, a term used as a central theme in many Christian sermons. Jesus refers to himself as the morning star in Revelation 22:16: "I Jesus have sent mine angel to testify unto you these things in the churches. I am the root and the offspring of David, and the bright and morning star."

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Lucifer: Lucifer is a Latin name. So how did it find its way into a Hebrew manuscript, written before there was a Roman language?

I'm learning more every day. Thanks for posting that MHGinTN! That was really interesting.