morning star · proper noun, noun1
From morning + star. Compare Middle English morwensterre, West Frisian moarnsstjer, Dutch morgenster, German Morgenstern, Swedish morgonstjärna, Icelandic morgunstjarna. Application to Satan derives, like the corresponding sense of Lucifer (which see), from what is probably a misinterpretation of Isaiah 14:12 (NIV: "How you have fallen from heaven, morning star, son of the dawn! You have been cast down to the earth, you who once laid low the nations!").
Morning Star · proper noun2
In reference to Mary, mother of Jesus, cf. Star of the Sea.
Etymology from Wiktionary, CC BY-SA 4.0.