Surname Romuldo (Romuldo 
) , across the world, is a very rare last name. The cognomen Romuldo is habitual in Nicaragua, where it is a very rare surname, Mexico, where it is an extremely rare surname, and Philippines. Measured by absolute frequency, the name is most common in Mexico, Brazil, and Philippines. More frequently, Romuldo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Romuldo | Mexico, Brazil, Philippines, United States, Malaysia |