Around the globe, Castil (Castil 
) is a very rare epicene first name. The forename Castil is habitual in South-eastern Asia, particularly Philippines, where it is a very rare unisex name. Much more prevalently, Castil is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Castil | Philippines, Mexico, France, United States, Nicaragua |