The truth is Lucifer is not the name of a fallen angel, Isaiah 14:11 says Lucifer is dead and Isaiah 14:16 says Lucifer is a man
Isaiah 14:11 Thy pomp is brought down to the grave, and the noise of thy viols: the worm is spread under thee, and the worms cover thee.
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!
14:16 They that see thee shall narrowly look upon thee, and consider thee, saying, Is this the man that made the earth to tremble, that did shake kingdoms;