Family name Castrro (Castrro 
) , all around the world, is a very rare cognomen. The cognomen Castrro is characteristic of Colombia, where it is a very rare surname, Brazil, where it is an extremely rare surname, and Philippines. Measured by absolute frequency, the name is most common in Colombia, Brazil, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Castrro | Brazil, United States, Colombia, Philippines |