| Name | Role | Place | Source | |
|---|---|---|---|---|
| F. Sybrandy | Mention | Sneek | Kohieren hoofdelijke omslag | |
| F. Sybrandy | Travelers | 1960 | Passenger registers | |
| F. Sybrandy | Mention | Sneek | Kohieren hoofdelijke omslag | |
| F. Sybrandy | Travelers | 1960 | Passenger registers | |
| S. F. Sybrandy | Mention | 1820 | Bolsward | Notarial records |
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