| Name | Role | Place | Source | |
|---|---|---|---|---|
| Willem Willemse van Leeuwen | Person in notarial deed | 1704 | Kockengen | Notarial records |
| Willem Willemse van Leeuwen | Registered | Vincennes/Parijs | Studbooks | |
| Willem Willemse van Leeuwen | Registered | 1717 | Dordrecht | Church records marriages |
| Willem Willemse van Leeuwen | Registered | 1737 | Leiden | |
| Willem Willemse van Leeuwen | Registered | 1751 | Leiden |
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