| Name | Role | Place | Source | |
|---|---|---|---|---|
| C Poortermans | Registered | 1771 | Amsterdam | Notarial records |
| C. Mz. Poortermans | Registered | 1794 | Amsterdam | Notarial records |
| C. Poortermans | Geconstitueerde | 1779 | Notarial records | |
| C. Poortermans | Geconstitueerde | 1792 | Notarial records | |
| C. Poortermans Mathyszoon | Geconstitueerde | 1778 | Notarial records | |
| C. Poortermans Mathyszoon | Geconstitueerde | 1776 | Notarial records | |
| C. Poortermans Mz | Geconstitueerde | 1784 | Notarial records | |
| Petronella C. Poortermans | Mention | 1813 | Nijmegen | Notarial records |
| Petronella C. Poortermans | Mention | 1813 | Nijmegen | Notarial records |
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