| Name | Role | Place | Source | |
|---|---|---|---|---|
| Klaas Dominicus Nijsingh | Person appearing | 1849 | Assen | Notarial records |
| Klaas Hendrikus Nijsingh | Deceased | 1843 | Hoogeveen | Tax register |
| Klaas Jans Nijsingh | Groom | 1819 | Vledder | Civil registration marriages |
| Klaas Jans Nijsingh | Person appearing | 1817 | Assen | Notarial records |
| Klaas Jans Nijsingh | Hoofdpersoon | 1846 | Assen | Notarial records |
| Klaas Nijsingh | Registered | Havelte | Population register | |
| Klaas Nijsingh | Mention | 1831 | Assen | Correspondence |
| Klaas Nijsingh | Child | 1841 | Hees | Civil registration births |
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