Family name Clerckx (Clerckx 
) , worldwide, is a rare cognomen. The last name Clerckx is habitual in Belgium, where it is quite a rare surname, Netherlands, where it is a very rare surname, and the United Kingdom, where it is an extremely rare surname. Not in comparison with a country's population, it most frequently occurs in Belgium, the United Kingdom, and France. Much less frequently, Clerckx is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Clerckx | France, Spain, United Kingdom, Netherlands, Belgium |
| paul clerckx Belgian politician, BE (b. 1887) |
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| louis clerckx politician, BE (b. 1893) |
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| karel clerckx cyclist (1933-1998), BE (b. 1933) |
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| rik clerckx Belgian athletics competitor (1936-1985), BE (b. 1936) |
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| eric clerckx Belgian actor, BE (b. 1964) |
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| bruno clerckx researcher (ORCID 0000-0001-5949-6459) |
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| sarah-lynn clerckx Belgian actor, BE |
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| prosper clerckx BE |
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Mr, Erik, Inge, Margo, Maggy, Maxim, Sanne, Sarah, Siggy, Serge, Alexi, Alain, Annie, Benny, Bruno, Kevin, Peter, Penny, Peggy, Robin, Robbe, Ruben, Eric, Elke, Nick, Nico, Ms, Kim, Leo, Jan, Marc, Alex, Bart, Kaat, Koen, Kris, David, Paul, Rene, Rudi, Dany, Dirk, Gert, Lena, Levi, Jose, Jens, Tijl, Roel, and Dylan