lucifer

Specifics

About the biblical translation

"The Scripture passage (Vulgate ‘Quomodo cecidisti de cælo, Lucifer, qui mane oriebaris?’ King James Bible ‘How art thou fallen from heauen, O Lucifer, sonne of the morning?’) is part of a ‘parable against the king of Babylon’ (Isaiah xiv. 4); but the mention of a fall from heaven led Christian interpreters to suppose that ‘king of Babylon’ was to be interpreted spiritually, as a designation of the chief of ‘the angels who kept not their first estate’.

Hence the general patristic view that Lucifer was the name of Satan before his fall. The Latin word was adopted in all the English versions down to 1611; the Revised version has daystar."

Oxford Dictionary, Historical Thesaurus

Discard all depictions of the diabolic "Lucifer" from movies ― if you can.
The biblical Satan and Lucifer are entirely unrelated.

The ancient Latin writers Varro and Cicero considered the etymology of Diana as allied to that of dies and connected to the shine of the Moon, noting that one of her titles is Diana Lucifera ("light-bearer").

... people regard Diana and the moon as one and the same. ... the moon (luna) is so called from the verb to shine (lucere). Lucina is identified with it, which is why in our country they invoke Juno Lucina in childbirth, just as the Greeks call on Diana the Light-bearer. Diana also has the name Omnivaga ("wandering everywhere"), not because of her hunting but because she is numbered as one of the seven planets; her name Diana derives from the fact that she turns darkness into daylight (dies). She is invoked at childbirth because children are born occasionally after seven, or usually after nine, lunar revolutions ...

Quintus Lucilius Balbus as recorded by Marcus Tullius Cicero and translated by P.G. Walsh. De Natura Deorum (On the Nature of the Gods), Book II, Part ii, Section c