Last name Castañeyra (Castañeyra 
) , worldwide, is a rare family name. The family name Castañeyra is habitual in Spain, where it is a rare surname, Peru, where it is a very rare surname, and Argentina. Very seldom, Castañeyra is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Castañeyra | Venezuela, Peru, Spain, Argentina |