| Name | Role | Place | Source | |
|---|---|---|---|---|
| Jan Hendrik Unico Backer van Leuwen | Registered | 1852 | Middelburg | Death duties files |
| Jan Hendrik van Leuwen | Employee | 1768 | Middelburg | Personnel-administration |
| Jan Hendrik van Leuwen | Father of groom | 1828 | Rotterdam | Civil registration marriages |
| Jan Hendrik van Leuwen | Father of groom | 1828 | Rotterdam | Civil registration marriages |
| Jan Hendrik van Leuwen | Registered | 1766 | Amsterdam | Notarial records |
| Jan Hendrik van Leuwen | Registered | 1744 | Amsterdam | Notarial records |
| Jan Hendrik van Leúwen | Groom | 1743 | Amsterdam | Register of notices of marriage |
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