Italian word bellezza comes from Proto-Indo-European *deh₂-, Proto-Indo-European *dāu-, and later Proto-Italic *dwenos (Good.)
*deh₂- (Proto-Indo-European)
*dāu- (Proto-Indo-European)
*dwenos (Proto-Italic)
Good.
*dw-ene- (Proto-Indo-European)
duonus (Latin)
duonus (Old Latin)
optimus (Latin)
Best; very good.
bella (Latin)
*bellitia (Vulgar Latin)
bellezza (Italian)
Beauty. Handsomeness (of a man). Loveliness (of a woman).