Cornelis Overwater
- Born: 1792, Amsterdam, Noord-Holland
- Christened: 30 Mar 1782, Amsterdam, Noord-Holland
- Marriage (1): Wilhelmina Christina Janssen on 30 Jul 1826 in Nieuwer-Amstel, Amstelveen, Noord-Holland
- Died: 15 Dec 1858, Nieuwer-Amstel, Amstelveen, Noord-Holland at age 66
Cornelis married Wilhelmina Christina Janssen on 30 Jul 1826 in Nieuwer-Amstel, Amstelveen, Noord-Holland. (Wilhelmina Christina Janssen was born in 1804 in Amsterdam, Noord-Holland, christened on 5 Mar 1804 in Amsterdam, Noord-Holland and died on 26 Feb 1842 in Nieuwer-Amstel, Amstelveen, Noord-Holland.)
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