Cognomen Castiñeiro (Castiñeiro 
) , across the world, is a very rare family name. The family name Castiñeiro is characteristic of Spain, where it is a very rare surname, and Argentina, where it is an extremely rare surname. Very seldom, Castiñeiro is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Castiñeiro | Spain, Argentina |