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Cognomen Kajdan (Kajdan
, Каждан
) , all over the world, is quite a rare last name. The family name Kajdan is habitual in Eastern Europe, particularly Poland, where it is quite a rare surname, Belarus, where it is a rare surname, and Russia. Measured by absolute frequency, it is the most numerous in Russia, Poland, and France. Likewise, Kajdan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kajdan | Canada, Poland, France, United States, Germany |
| Каждан | Belarus, Kazakhstan, Russia, Ukraine |