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 | Germany, United Kingdom, Australia, Poland, Denmark |
| Клейн | Azerbaijan, Kazakhstan, Russia, Moldova, Ukraine |
|
zbigniew klejn Polish historian (1927-2005), PL (b. 1927) |
|
| dorota klejn researcher |
|
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| jacob klejn BE |
|