| Name | Role | Place | Source | |
|---|---|---|---|---|
| Charles Maria J. Backer | Registered | 1849 | Empel | Population register |
| Dorothea Maria J. Backer | Registered | 1850 | Amsterdam | Population register |
| Maria J. Backer | Witness | 1702 | Rijsbergen | Church records baptisms |
| Maria J. de Backer | Travelers | 1919 | Rotterdam | Passenger registers |
| Maria J. de Backer | Registered | 1899 | Zevenbergen | Population register |
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