Family name Romero Calderón (Romero Calderón 
) , across the world, is a very rare last name. The family name Romero Calderón is habitual in Spain, where it is a very rare surname, and Peru, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Romero Calderón | Spain, Peru |
Pilar, Carlos, Leonardo, and César Antonio