Cornelis Jans Koopman was born 16 October 1712 in Wervershoof, North Holland, Netherlands to Johannes Koopman (1689-1752) and Meinum Jans (-) and died 19 January 1789 Wervershoof, North Holland, Netherlands of unspecified causes. He married Tetje Claas (-) 28 January 1737 in Wervershoof, North Holland, Netherlands. He married Trijntje Koster (1725-1788) 11 September 1746 in Wervershoof, North Holland, Netherlands.
Children
| Name | Birth | Death | Joined with |
| Meinum Koopman (1738-1738) | |||
| Name | Birth | Death | Joined with |
| Meinum Koopman (1747-1760) | |||
| Petrus Koopman (1750-1751) | |||
| Petrus Koopman (1752-1810) | 18 February 1752 Wervershoof, North Holland, Netherlands | 1 June 1810 Opmeer, North Holland, Netherlands | Maartje Schouten (1750-1792) Stijntje Mulder (1752-1818) |
| Johannes Koopman (1754-1838) | 9 March 1754 Wervershoof, North Holland, Netherlands | 26 February 1838 Wervershoof, North Holland, Netherlands | Maartje de Boer (-1802) Trijntje Dekker (1764-1853) |
| Jacob Koopman (1756-1837) | |||
| Monegunda Koopman (1759-) | |||
| Veronica Koopman (1759-) | |||
| Cornelis Koopman (1761-1823) | 9 January 1761 Wervershoof, North Holland, Netherlands | 15 September 1823 Wervershoof, North Holland, Netherlands | Dieuwertje Commandeur (1776-1836) |
| Simon Koopman (1766-1772) | |||
Siblings
| Name | Birth | Death | Joined with |
| Cornelis Koopman (1712-1789) | 16 October 1712 Wervershoof, North Holland, Netherlands | 19 January 1789 Wervershoof, North Holland, Netherlands | Tetje Claas (-) Trijntje Koster (1725-1788) |
Residences
Footnotes (including sources)
| ‡ General |