Surname Castani (Castani 
) , throughout the world, is a rare family name. The surname Castani is habitual in Italy, where it is a rare surname, the Democratic Republic of the Congo, and France, where it is an extremely rare surname. Very seldom, Castani is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Castani | Italy, Democratic Republic of the Congo, France, Indonesia, Germany |