The name Giulio is a boy's name of Italian origin. Giulio and is often added to lists like Popular Italian Baby Names and discussed in our forums with posts like "Harry Potter House Sorting Name Game".
From the experts:
Since the female Giulia and Giada have crossed the Atlantic, we think brother Giulio is a good candidate to follow, being more manageable than the longer (but equally attractive) Giuliano, Giovanni and Giacomo. And of course the most famous Giulio of all is the Emperor, Giulio Cesare.