| Name | Role | Place | Source | |
|---|---|---|---|---|
| Johan Lodewijk Ditmar | Registered | 1819 | Amsterdam | Population register |
| Johan Lodewijk Ditmar | Registered | 1825 | Amsterdam | Population register |
| Lodewijk Ditmar | Witness | 1887 | Brussel | Civil registration marriages |
| Lodewijk Ditmar | Father of groom | 1834 | Maastricht | Civil registration marriages |
| Lodewijk Godhart Ditmar | Registered | 1789 | Amsterdam | Church records burials |
| Lodewijk Jacobus Pieter Ditmar | Father | 1860 | Tongeren | Civil registration births |
| Lodewijk Johan Ditmar | Registered | 1825 | Amsterdam | Population register |
| Peter Lodewijk Ditmar Geselschap | Child | 1883 | Doesburg | Civil registration births |
| Peter Lodewijk Ditmar Geselschap | Deceased | 1883 | Doesburg | Civil registration deaths |
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