Cognomen Risdan (Risdan 
) , worldwide, is a rare last name. The cognomen Risdan is characteristic of Slovenia, where it is a rare surname, Indonesia, where it is a very rare surname, and Malaysia, where it is an extremely rare surname. In absolute terms, it most frequently occurs in Indonesia, Slovenia, and India. More prevalently, Risdan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Risdan | United States, India, Indonesia, Slovenia, Malaysia |