Cognomen Castule (Castule 
) , around the globe, is a very rare surname. The surname Castule is characteristic of Philippines, where it is a very rare surname, France, and the United States, where it is an extremely rare surname. Much less frequently, Castule is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Castule | Canada, United States, Philippines, France |