Surname Hiernaux (Hiernaux 
) , throughout the world, is a rare last name. The cognomen Hiernaux is characteristic of Belgium, where it is quite a rare surname, France, where it is a rare surname, and New Zealand, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Belgium, France, and Spain. Very seldom, Hiernaux is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Hiernaux | France, Spain, United Kingdom, Mexico, Belgium |
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jules hiernaux pedagogue and Walloon activist, BE (b. 1881) |
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yves hiernaux Entrepreneur from Belgium, BE |
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| jean hiernaux (b. 1921) |
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| willy hiernaux Belgian politician (1934-1997), BE (b. 1934) |
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| jean-claude hiernaux French politician, FR (b. 1943) |
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| jean-pol hiernaux BE (b. 1957) |
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| kevin hiernaux French motorcycle rider, FR |
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| jean-pierre hiernaux BE |
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Mr, Andre, Annie, Agnã, Aurã, Chris, Cathy, Cyril, Betty, Bruno, Kelly, Kevin, Robin, Denis, Glenn, Louis, Lucie, Lucas, James, Hakim, Henri, Ferna, Alain, Ilana, Aline, Serge, Seb, Sã, Cã, Guy, Luc, Marc, Manu, Anne, Grã, Lola, Jean, Juan, Thea, Nils, Noã, Eric, Yves, Marie, Manon, Sarah, Sacha, Steve, and Odile