Surname Gregorio Arnaldo (Gregorio Arnaldo 
) , throughout the world, is an extremely rare cognomen. The cognomen Gregorio Arnaldo is habitual in Latin America and the Caribbean, particularly Chile, where it is a very rare surname. More prevalently, Gregorio Arnaldo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gregorio Arnaldo | Spain, Peru, Venezuela, Ecuador, Chile |