| Name | Role | Place | Source | |
|---|---|---|---|---|
| Willem Pieters de Kooningh | Deceased | 1732 | IJsselmonde | Church records burials |
| Willem de Kooningh | Deceased | 1719 | Rotterdam | Church records burials |
| Willem de Kooningh | Person in notarial deed | 1774 | Zierikzee | Notarial records |
| Willem de Kooningh | Witness | 1694 | Leiden | |
| Willem de Kooningh | Groom | 1694 | Leiden |
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