All over the world, Castanier (Castanier 
) is a very rare masculine forename. The first name Castanier is characteristic of Eastern Asia, particularly China, where it is an extremely rare boy's name. Much more frequently, Castanier is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Castanier | Belgium, Mexico, United States, Canada, France |