Cognomen Justinio (Justinio 
) , worldwide, is a very rare family name. The last name Justinio is habitual in Latin America and the Caribbean, particularly Venezuela, where it is a very rare surname, Peru, where it is an extremely rare surname, and Brazil. More frequently, Justinio is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Justinio | Peru, Philippines, Venezuela, Brazil, Ecuador |