Family name Leersum (Leersum 
) , all over the world, is a rare last name. The surname Leersum is habitual in Western Europe, particularly Netherlands, where it is quite a rare surname, Belgium, where it is a rare surname, and Germany, where it is an extremely rare surname.
| VARIANT | COUNTRY |
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| Leersum | Germany, Belgium, United Kingdom, United States, Netherlands |
| henricus petrus van leersum politician (1763-1854) (b. 1763) |
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| gerrit barend leersum (b. 1865) |
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| frank van leersum researcher (ORCID 0000-0002-1443-6345) |
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| catharina m van leersum researcher (ORCID 0000-0002-1003-0794) |
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| valerie van leersum (b. 1973) |
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