Many Christians mistakenly believe that “Lucifer” is the name of the devil (Satan). They believe this simply because they hear others repeating it. The secular world also loves to repeat this, for they do not know any better. However, this is a false interpretation of Isaiah 14:12 (KJV translation). The context of the verse mentioning “Lucifer” is speaking of a specific man, a king/ruler, not Satan.
You might be wondering why spend time addressing such a silly and unimportant false teaching (for it obviously is not a matter of salvation), but I am doing so to illustrate a pattern that you need to watch for, which is: where you find one false teaching, you will almost always find others lurking nearby from the same group, sect or cult. So, when you hear the name “Lucifer” being bandied about as the name for Satan, you know to be on the alert for other false teachings as well! 
 See also: Jackson, Wayne. “Who Is Lucifer?” ChristianCourier.com. Access date: November 8, 2018. https://www.christiancourier.com/articles/158-who-is-lucifer