Worldwide, Casiel (Casiel 
) is a very rare primarily male, but scarcely feminine forename. The first name Casiel is habitual in Latin America and the Caribbean, particularly Brazil, where it is an extremely rare male name. Likewise, Casiel is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Casiel | Philippines, Mexico, Argentina, Brazil, United States |