Last name Lajoux (Lajoux 
) , around the world, is a rare cognomen. The cognomen Lajoux is habitual in Monaco, where it is quite a common surname, France, where it is a rare surname, and the United States, where it is an extremely rare surname. Much less frequently, Lajoux is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Lajoux | Brazil, United States, Monaco, France |
| edmond jean lajoux (b. 1890) |
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| jean-dominique lajoux French photographer, FR (b. 1931) |
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| alain lajoux French politician, FR (b. 1952) |
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| christian lajoux FR (b. 1948) |
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| isabelle lajoux French politician, FR (b. 1960) |
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| david lajoux Monegasque alpine skier (b. 1966) |
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Mr, Regis, David, Donna, Linda, Louis, Jacky, Julie, Nelly, Henri, Maxime, Michel, Sandra, Sylvie, Alexis, Annick, Armony, Arnaud, Amanda, Amaury, Celine, Cecile, Ronan, Bruno, Cyril, Cathy, Ms, Guy, Jã, Tom, Tim, Marc, Clã, Dina, Jean, Eric, Claude, Fred, Yves, Marie, Manon, Sanae, Sarah, Serge, Scott, Alain, Andre, Annie, Frã, and Claire