Cognomen Kleyn (Kleyn 
, Клейн 
, Клеын ) , in all the world, is quite a common family name. The family name Kleyn is characteristic of Kazakhstan, where it is quite a rare surname, Moldova, and Netherlands. Measured by absolute frequency, it is the most numerous in Russia, South Africa, and Kazakhstan. Much less frequently, Kleyn is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kleyn | Australia, Netherlands, United States, Sri Lanka, South Africa |
| Клейн | Kazakhstan, Azerbaijan, Ukraine, Moldova, Russia |
| Клеын | Russia |
| Клеин | Belarus, Russia, Kyrgyzstan, Kazakhstan |
| adelaide geertruid kleyn ca. 1786-1858, NL (b. 1786) |
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| hendrik gerrit kleyn Dutch university teacher, NL (b. 1859) |
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| laurens kleyn NL (b. 1870) |
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jan de kleyn NL (b. 1941) |
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| alberta kleyn Dutch Righteous Among the Nations, NL (b. 1907) |
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| cornelis kleyn NL (b. 1903) |
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| jerzy kleyn (1924-1982) actor (b. 1924) |
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| jan kleyn Track and field athlete, NL (b. 1925) |
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matthijs kleyn Dutch television presenter, NL (b. 1979) |
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| peter kleyn (born 1948) (b. 1948) |
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| onno kleyn Dutch journalist, NL (b. 1957) |
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| kostyantyn kleyn ukrainian singer, UZ (b. 1958) |
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| jean-pierre de kleyn (b. 1951) |
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| jacob kleyn NL (b. 1952) |
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| aart kleyn university teacher at Leiden University |
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