| Name | Role | Place | Source | |
|---|---|---|---|---|
| Antonius Gerardus Jozeph Keyzer | Mention | 1918 | Wonseradeel | Notarial records |
| Jozeph Keyzer | Deceased | 1831 | Leeuwarden | Civil registration deaths |
| Jozeph de Keyzer | Registered | 1841 | Inschrijfregister | |
| Petrus Gerhardus Jozeph Keyzer | Conscript | 1910 | Militia records | |
| Petrus Gerhardus Jozeph Keyzer | Child | 1890 | Harlingen | Civil registration births |
| Sjef Keyzer | Tewerkgestelde | 's-Gravenhage, Rotterdam | Workforce registration | |
| Sjef Keyzer | Tewerkgestelde | 's-Gravenhage, Rotterdam | Workforce registration |
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