hēlēl הֵילֵל ‘star’ (Hebrew)

Etymology^?: from hālal הָלַל ‘to shine / to boast / to be foolish’ ( in the sense of brightness )
Roots: הלל

hēlēl n, m
Lucifer = "light-bearer"
1) shining one, morning star, Lucifer
 1a) of the king of Babylon and Satan (fig.)
2) (TWOT) 'Helel' describing the king of Babylon