Cognomen Louin (Louin 
) , in the entire world, is a rare last name. The surname Louin is characteristic of France, where it is a rare surname, Malaysia, and Nigeria, where it is an extremely rare surname. In absolute terms, it most frequently occurs in France, Malaysia, and the United States. Also, Louin is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Louin | Nigeria, France, United States, Malaysia, Philippines |
| pierrette louin French espionage agent, FR (b. 1920) |
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| gaelle louin researcher (ORCID 0000-0002-2357-6796) |
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| belouw louin Peerage person ID=158289 |
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| edna louin Peerage person ID=158288 |
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