| Name | Role | Place | Source | |
|---|---|---|---|---|
| Frederika W. Overkamp | Registered | 1834 | Winterswijk | Population register |
| Johan W. Overkamp | Mention | 1812 | Nijmegen | Notarial records |
| W Overkamp | Registered | 1795 | Leiden | |
| W. A. Overkamp | Registered | Eibergen | Population register | |
| W. A. Overkamp | Registered | 1883 | Population register | |
| W. Overkamp | Travelers | 1906 | Rotterdam | Passenger registers |
| W. Overkamp | Signatory | 1878 | 's-Gravenhage | Verzoekschriften |
| W. Overkamp | Military | Studbooks | ||
| W. Overkamp | Mention | 1827 | Frederiksoord | Correspondence |
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