Family name Fidellis (Fidellis 
) , globally, is a rare surname. The surname Fidellis is habitual in Brazil, where it is a very rare surname, Nigeria, and the United States, where it is an extremely rare surname. Also, Fidellis is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Fidellis | Brazil, Zimbabwe, United States, Nigeria, Venezuela |