| Name | Role | Place | Source | |
|---|---|---|---|---|
| Johan Arendt Potharst | Registered | 1738 | Amsterdam | Notarial records |
| Johan Ernst Potharst | Registered | 1810 | Amsterdam | Estate papers |
| Johan Potharst | Registered | 1735 | Amsterdam | Notarial records |
| Johan Potharst | Registered | 1883 | Haarlem | Index on convicts |
| Johan Potharst | Registered | 1883 | Haarlem | Index on convicts |
| Johan Potharst | Registered | 1911 | Population register | |
| Johan Potharst | Registered | 1911 | Population register | |
| Johan Potharst | Registered | 's-Gravenhage, Rotterdam | CABR dossiers | |
| Johan Simon Potharst | Employee | 1761 | Amsterdam | Personnel-administration |
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