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Worldwide, Castus (Casto
, Casta
, Castus
) is a common mostly boy's, but uncommonly feminine first name. The given name Castus is habitual in Equatorial Guinea, where it is quite a common male name, Nicaragua, where it is quite a common unisex name, and Bolivia, where it is quite a rare unisex name. In absolute terms, it is commonest in Tanzania, Mexico, and Bolivia. Also, Castus is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Casto | Spain, Tanzania, Italy, Mexico, United States |
| Casta | Spain, Philippines, Italy, Mexico, United States |
| Castus | Belgium, Tanzania, Brazil, France, United States |
| Каст | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |