All around the world, Chastelain (Chastelain 
) is a rare masculine forename. The forename Chastelain is habitual in Sub-Saharan Africa, particularly the Democratic Republic of the Congo, where it is a rare masculine name. Very seldom, Chastelain is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Chastelain | United Kingdom, South Africa, Spain, France, Democratic Republic of the Congo |