Cognomen Arnulio (Arnulio 
) , around the world, is a very rare last name. The last name Arnulio is habitual in Honduras, where it is a very rare surname, Nicaragua, and Spain. Not in comparison with a country's population, it most frequently occurs in Spain, Honduras, and Mexico. More prevalently, Arnulio is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Arnulio | Bolivia, Peru, Philippines, Colombia, Spain |