Cognomen Castañondo (Castañondo 
) , all around the world, is a very rare last name. The surname Castañondo is habitual in Argentina, where it is a very rare surname, and Spain, where it is an extremely rare surname. Likewise, Castañondo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Castañondo | Argentina, Spain |