From halal (in the sense of brightness); the morning-star -- lucifer.
see HEBREW halal
H1966. helel
הֵילֵל Isaiah 14:12 see below הלל.
הִים see הוּם.
הֵילֵל noun masculine appellative shining one, epithet of king of Babylon, ה מִשָּׁמַיִם נָפַלְתָּ ׳אֵיךְ בֶּןשָֿׁ֑חַר Isaiah 14:12 how art thou fallen, shinning one, son of dawn ! i.e. star of the morning. (compare Assyrian muštilil, epithet of (Venus a) morning-star III R Isaiah 57:60 OppJAS 1871, 448 SchrSK 1874, 337 COTad. loc.)