Last name Joniaux (Joniaux 
) , across the world, is a rare family name. The cognomen Joniaux is habitual in Belgium, where it is a rare surname, France, and Ecuador, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in France, Belgium, and the United States. Very seldom, Joniaux is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Joniaux | Belgium, Brazil, France, Ecuador, United States |
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marie-thérèse joniaux Belgian serial killer, BE (b. 1844) |
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| georges joniaux (b. 1898) |
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| germain joniaux BE |
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| henri joniaux |
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| patrick joniaux |
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Mr, Carla, Cesar, Paola, David, Diana, Linda, Lucie, Lydie, Jaime, Julie, Henry, Fredo, Marcos, Marlon, Magali, Maxime, Sandra, Sophie, Alexia, Alesse, Andrea, Chris, Annie, Alain, Sonia, Ms, Ana, Ben, Lee, Luc, Jay, Jen, Jim, Mark, Anne, Andrew, Kara, Luis, Lynn, John, Jean, Juan, Elba, Eddy, Eric, Hugo, Maria, Lisa, and Annick