Surname Clein (Clein 
) , worldwide, is quite a rare last name. The cognomen Clein is habitual in Ireland, where it is a rare surname, Uruguay, and Kenya. Measured by absolute frequency, it most frequently occurs in Brazil, the United States, and Kenya. Very seldom, Clein is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Clein | United Kingdom, Kenya, United States, Tanzania, Brazil |
| jean clein (b. 1466) |
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| reubin clein American publisher (1905-1989) (b. 1905) |
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| john clein (b. 1907) |
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| rocco clein German journalist, DE (b. 1968) |
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| natalie clein British musician, GB (b. 1977) |
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| louisa clein British actress, GB (b. 1979) |
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| joy clein |
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