Family name Sadeleer (Sadeleer 
) , globally, is a rare last name. The cognomen Sadeleer is habitual in Belgium, where it is quite a rare surname, Netherlands, where it is a very rare surname, and Croatia. In absolute terms, it is the most numerous in Western Europe, particularly Belgium, Germany, and Netherlands.
| VARIANT | COUNTRY |
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| Sadeleer | Belgium, United Kingdom, Netherlands, France, Germany |
| louis de sadeleer Belgian politician and diplomat (1852-1924), BE (b. 1852) |
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| jacques de sadeleer Belgian painter, BE (b. 1920) |
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hugo de sadeleer racing driver, CH (b. 1997) |
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| laurens j de sadeleer researcher |
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| jerome de sadeleer Swiss rally raid driver (b. 1988) |
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Mr, Ester, Frans, Ilona, Maxime, Alison, Arnaud, Amaury, Carlos, Björn, Louise, Jerome, Jurgen, Nefeli, Emerik, Martine, Belinda, Nicolas, Valerie, Vanessa, Vincent, Quentin, Joost, Matthias, Jason, Geert, Ms, Sue, Ann, Bea, Ger, Tom, Mark, Anne, Bart, Bjã, Paul, Rudy, Dave, Leen, Lola, Zjef, Serge, Alain, Peter, Ruben, David, Linda, and Severine