Cognomen Callaerts (Callaerts 
) , across the world, is a rare last name. The last name Callaerts is habitual in Belgium, where it is quite a rare surname, Norway, where it is a very rare surname, and Netherlands. Measured by absolute frequency, the name is most common in Western Europe, particularly Belgium, France, and Netherlands.
| VARIANT | COUNTRY |
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| Callaerts | Norway, United Kingdom, Belgium, France, Netherlands |
| joseph callaerts Belgian organist and composer, BE (b. 1830) |
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jos callaerts BE (b. 1896) |
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| raymond callaerts politician (1926-2005), BE (b. 1926) |
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| jean callaerts Belgian bicycle racer, BE (b. 1932) |
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| nancy callaerts Belgian athletics competitor, BE (b. 1971) |
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| patrick callaerts researcher (ORCID 0000-0003-4530-4561) |
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| dirk callaerts Ph.D. Katholieke Universiteit Leuven 1989 |
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| patrick callaerts molecular biologist, researcher, BE |
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Mr, Jill, Tine, Tijs, Nina, Nele, Elke, Erik, Hugo, Fran, Ilse, Yana, Yari, Marco, Mieke, Sarah, Simon, Sofie, Stijn, Birte, Karen, Katja, Jean, Loic, Gita, Dirk, Ms, Mia, Sam, Ben, Kim, Luc, Jan, Tom, Vic, Ivo, Kelly, Wim, Mark, Stef, Sven, Andy, Anja, Ciel, Bart, Koen, Kurt, Rudi, Marc, and Kiana