| Name | Role | Place | Source | |
|---|---|---|---|---|
| W van Idsinga | Registered | 1842 | Breda | Population register |
| W. Idsinga | Travelers | 1938 | Rotterdam | Passenger registers |
| W. Idsinga | Registered | 1955 | Leeuwarden | Chamber of Commerce |
| W. Idsinga | Travelers | 1952 | Rotterdam | Passenger registers |
| W. Idsinga | Military | 's-Gravenhage | Staat van dienst | |
| W. Idsinga | Registered | 's-Gravenhage | Personnel File |
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