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Italian word giorno comes from Proto-Indo-European *dyew-, Latin diu, Proto-Italic *djēm, and later Proto-Italic *djous (Jupiter. Day, sky.)
*dyew- (Proto-Indo-European)
god, sky, sky, sky, heaven
diu (Latin)
Continually, all day. Long enough. Long, long while, for a long time.
*djēm (Proto-Italic)
*djous (Proto-Italic)
Jupiter. Day, sky.
diovos (Latin)
diem (Latin)
diurnus (Latin)
Daily. Of the day Day (medieval Latin only).
diurnum (Latin)
giorno (Italian)
Day.