Thinking that Lucifer is the devil is a misconception based on traditional thinking.Lucifer comes from the Latin word Lucifero which means "light bearer." It comes from the original Hebrew word "Hel el." This means "shining one." This is a title given to the Babylonian dynasty led by King Nebuchadnezzar.Where it speaks of "Lucifer", this shining one,in the book of Isaiah,it speaks of judgment against the city of Babylon.It also refers to "Lucifer" as a man.Satan is not a man,he is a spirit.It also says that he will be led down to the grave.We know from the book of revelation that satan the devil is reserved for the eternal lake of fire.So this could not be referring to satan the devil.
Here is the passage that mentions "Lucifer."
Isaiah 14:12 How art thou fallen from heaven, O Lucifer, son of the morning! how art thou cut down to the ground, which didst weaken the nations!
It is usually translated to "morning star."
If we go down just a few scriptures it says this about Lucifer.
Isaiah 14:16 Those who see you stare at you,
they ponder your fate:
“Is this the man who shook the earth
and made kingdoms tremble,
If we go just one scripture before it says this.
Isaiah 14:15 But you are brought down to the realm of the dead,
to the depths of the pit.
So here we clearly see from reading and studying that Lucifer, or morning star, is actually referring to the Babylonian dynasty.This can also be confirmed by reading the book of Daniel ch.4.When Daniel is explaining to King Nebuchadnezzar everything that is told to him goes hand and hand with what is spoken of in Isaiah 14.Compare Isaiah 14:12 with Daniel 4:15.It speaks of Lucifer being cut down to the ground.It is referring to King Nebuchadnezzar.Daniel explains that the tree that has been cut down to a stump represents his kingdom being cut down but he would regain it after 7 years.The stump regrows.Kingdom arises again.
Another thing,Satan the devil has been called that since man has been on earth.Satan means adversary.Devil means slanderer,liar.These are titles and not names.He was called this before and after he and the other demons were cast down to earth.
Jude 1:9 New International Version (NIV)
9 But even the archangel Michael, when he was disputing with the devil about the body of Moses, did not himself dare to condemn him for slander but said, “The Lord rebuke you!”
Revelation 12:9 The great dragon was hurled down--that ancient serpent called the devil, or Satan, who leads the whole world astray. He was hurled to the earth, and his angels with him.
Satan the devil has been called that since the OT.He was cast down in the book of Revelation.This was well after Jesus.
Yes, Satan the devil has been called that since the old Hebrew Scriptures as found him titled at Job 1:6-8,12; Job 2:4