Family name Ridolf (Ridolf 
) , worldwide, is a very rare cognomen. The family name Ridolf is characteristic of Indonesia, where it is a very rare surname, Brazil, and the United States, where it is an extremely rare surname. More prevalently, Ridolf is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ridolf | Germany, Indonesia, United States, India, Brazil |