| Name | Role | Place | Source | |
|---|---|---|---|---|
| Marc Isidore De Keyser | Groom | 1842 | Leuven | Civil registration marriages |
| Marc Keyser | Witness | 1858 | Brussel | Civil registration marriages |
| Marc Pierre Keyser | Deceased | 2013 | Bobigny | Civil registration deaths |
| Marc Pierre Keyser | Deceased | 2013 | Bobigny | Civil registration deaths |
| Marc Thomas De Keyser | Child | 1920 | Gent | Civil registration births |
| Marc de Keyser | Deceased | 2019 | Ronse | Rouwbrieven |
| Marc de Keyser | Deceased | 2016 | Badalona {E}, Hamme | Rouwbrieven |
| Marc de Keyser | Deceased | 2001 | Gent | Rouwbrieven |
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