| Name | Role | Place | Source | |
|---|---|---|---|---|
| Casper Frowijn | Registered | 1641 | Amsterdam | Notarial records |
| Jan Casper Coenraad Frowijn | Deceased | 1862 | Ootmarsum | Civil registration deaths |
| Jan Casper Coenraad Frowijn | Deceased | 1917 | Fleringen | Civil registration deaths |
| Jan Casper Coenraad Frowijn | Deceased | 1917 | Tubbergen | Civil registration deaths |
| Jan Casper Koenraad Frowijn | Child | 1861 | Ootmarsum | Civil registration births |
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