Last name Clain (Clain 
, 克莱恩 
, كلاين) , in all the world, is quite a common family name. The cognomen Clain is characteristic of Reunion, where it is a common surname, France, where it is quite a rare surname, and Mauritius. In absolute terms, it most frequently occurs in France, Reunion, and Romania. Much less frequently, Clain is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Clain | Romania, Kenya, Reunion, United States, France |
| 克莱恩 | China |
| pablo clain Czech Jesuit missionary, 1652–1717, PH (b. 1652) |
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| gilbert clain French sculptor, FR (b. 1941) |
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| olivier clain philosopher and professor at Université Laval, CA (b. 1954) |
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| médéric clain French bicycle racer, FR (b. 1976) |
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| fabien clain French jihadist (1978-2019), FR (b. 1978) |
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| jérôme clain researcher |
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| stéphane clain researcher |
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| jason b clain researcher |
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| leonhard clain |
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| alisabet j clain |
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| jean-michel clain FR (b. 1980) |
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| edwin clain French squash player, FR (b. 1999) |
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