Last name Ромуальдо (Romualdo 
, Ромуальдо 
) , across the world, is a common cognomen. The last name Ромуальдо is habitual in Mexico, where it is quite a common surname, Cabo Verde, and Spain, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in Mexico, Brazil, and Philippines. Also, Ромуальдо is the forename as well as the last name.