Lucifer was his name before he fell and took some angels with him for refusing to serve Jesus. His name changed as he changed from an angel of incredible beauty, intelligence and light to Satan.
Throughout Sacred Scripture, we find mention of Satan, the devil. The word Satan comes from the Hebrew word , meaning to oppose, to harass someone; so Satan would be the tempter, the one to make up trip and fall, the one to turn us from God. The word devil is derived from the Greek , meaning an accuser, a slanderer. Other synonyms for Satan in Sacred Scripture are the Evil One, Beelzebub, the Accuser, the Tempter, the Great Dragon and the Ancient Serpent. Even Lord of the Flies.
We believe that in the beginning, God created Satan as a good angel: (Lucifer) the Lateran Council IV (1215) stated, “The devil and the other demons were indeed created naturally good by God, but they became evil by their own doing.” These angels irrevocably chose through their free will to rebel against God and not to serve Him. For this rebellion, they were cast into hell. Sacred Scripture attests to this belief. Our Lord, speaking of the final judgment, said, “Then (the Son of Man) will say to those on His left, ‘Out of My sight, you condemned, into that everlasting fire prepared for the devil and his angels’” (Mt 25:41).
here’s another article:
tanbooks.com/doct/angels.htm