| Name | Role | Place | Source | |
|---|---|---|---|---|
| Jan Claesz Loopeker | Buyer | 1752 | Amsterdam | Waivers |
| Jan Gerritz Loopeker | Groom | 1704 | Nieuwkoop, Nieuwkoop, Nieuwkoop | |
| Jan Klase Loopeker | Registered | 1750 | Amsterdam | Church records burials |
| Jan Klase Loopeker | Registered | 1750 | Amsterdam | Church records burials |
| Jan Loopeker | Registered | 1779 | Amsterdam | Church records burials |
| Jan Loopeker | Father | 1778 | Amsterdam | Church records baptisms |
| Jan Loopeker | Child | 1677 | Nieuwkoop en Noorden |
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