Meaning and Name Origin
Oratio \o-ra-tio\ as a name for boys. Oratio's name origins are Latin and Italian, and the name Oratio means "prayer". Oratio is a derivative of Horace (Latin): from Horatius, a Roman family clan name. Oratio is also a form of Orazio (Italian): May also be a variant of Horace, an ancient Latin clan name.
Oratio is an uncommon given name for males. Oratio is an equivalently rare last name too for all people. (2000 U.S. Census)
Shown below is an analysis of the popularity of the boy name Oratio and related names. Popular varying forms of Oratio (#unlisted) appearing in the Top 1000 are Horatio and Horace. Adoption of these boy names reached its apex during 1880-1889 and has become much lower since, with the form Horace becoming less trendy. (2014 Birth Statistics)