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Cognomen Klejn (Klejn
, Клейн
) , worldwide, is quite a rare family name. The surname Klejn is habitual in Kazakhstan, where it is quite a rare surname, Moldova, and Russia. Not in comparison with a country's population, it is commonest in Russia, Kazakhstan, and Ukraine. Much less frequently, Klejn is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Klejn | Poland, Australia, United Kingdom, Denmark, Germany |
| Клейн | Kazakhstan, Russia, Moldova, Azerbaijan, Ukraine |