Cognomen Gajdan (Gajdan 
) , worldwide, is a rare last name. The surname Gajdan is habitual in Hungary, where it is quite a rare surname, Germany, where it is an extremely rare surname, and the United States. Very seldom, Gajdan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gajdan | Hungary, Poland, United States, Germany |