Italian, Spanish, Portuguese: Italian, Spanish and Portuguese form of Aemilius (see EMIL). (behindthename.com)
Derived from the Latin Aemilius, an old Roman family name probably derived from aemulus (rival, trying to equal or excel, emulating) There are some who think Emilio is of Germanic origin and derive it from the element amal (work).From A World of Baby Names by Teresa Norman.
Dashing and popular Italian and Spanish favorite, as is Emiliano.Nicknames & Variations:Emileo, Llillo, Emiliano, Miyo, Milo, Melo, Emielo, Imelio, Aemilio, Hemilio, Emelio (nameberry.com)
of the Name Emilio (babynamewizard.com)
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New Zealand Baby Names 