"The Hebrew word translated “Lucifer” means “shining one.” The Septuagint uses the Greek word that means “bringer of dawn.” Hence, some translations render the original Hebrew “morning star” or “Daystar.” But Jerome’s Latin Vulgate uses “Lucifer” (light bearer), and this accounts for the appearance of that term in various versions of the Bible." - par. 2; Questions From Readers; 9/15/2002 Watchtower.
The 'name' Lucifer occurs once in the Scriptures (Isa. 14:12) and only in some versions of the Bible. Traditionally, Lucifer is a name that in English generally refers to the Devil before being cast from heaven. But this description is given to a man and not to a spirit creature as is further seen by the statement: “Down to Sheol you will be brought.” Sheol is the common grave of mankind—not a place occupied by Satan the Devil. Additionally, those seeing Lucifer brought into this condition ask: “Is this the MAN that was agitating the earth?” Clearly, “Lucifer” refers to a human, not to a spirit creature. - Isaiah 14:4, 15, 16. (For more, see: Is Satan Lucifer?; Jimspace)
Additionally, some have erroneously tried to equate Jesus as the "shining one" mentioned at Isaiah 14:12 because the resurrected and exalted Jesus spoke of himself as “the bright morning star” at Revelation 22:16. But Jesus is not the "shining one" mentioned at Isaiah 14:12 since, not only is the actual description different, but Jesus is a spirit person - not the person clearly described here as a physical human being.
For More About Satan the Devil, See:
Who is Satan the Devil? (Search For Bible Truths)