Cognomen Hardouin (Hardouin 
) , in all the world, is quite a common last name. The family name Hardouin is characteristic of France, where it is quite a rare surname, Mauritius, and Belgium, where it is a rare surname. Measured by absolute frequency, it is the most numerous in France, the United States, and South Africa. Much less frequently, Hardouin is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Hardouin | France, United States, Belgium, South Africa, Argentina |
| hardouin de ponthieu (b. 797) |
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| hardouin de bueil (b. 1347) |
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hardouin de péréfixe de beaumont Roman Catholic archbishop, FR (b. 1606) |
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jean hardouin French classical scholar (1646-1729), FR (b. 1646) |
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hardouin de chalon de maisonnoble French catholic priest (1691-1762), FR (b. 1691) |
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| michel hardouin French architect (1647-1687), FR (b. 1647) |
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| jules michel alexandre hardouin French architect, FR (b. 1685) |
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| henri hardouin French composer, FR (b. 1727) |
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| jacques hardouin de châlons Frendh diplomat, FR (b. 1738) |
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| rené julien hardouin French politician (1737-1793), FR (b. 1739) |
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| jean-charles hardouin de chalon de maisonnoble French politician, FR (b. 1740) |
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| julien-pierre-jean hardouin French politician, FR (b. 1753) |
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| louis hardouin tarbe French politician (1753-1806), FR (b. 1753) |
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| julien hardouin-rivery French politician (1759-1825), FR (b. 1759) |
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céleste hardouin French teacher and activist (1832-1904), FR (b. 1832) |
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